Bio 201 Human Anatomy and Physiology
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Free Bio 201 Human Anatomy and Physiology Questions
Which directional term would complete the sentence correctly?
The knee is—---------------- to the ankle.
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proximal
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distal
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posterior
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medial
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lateral
Explanation
Correct Answer:
proximal
Explanation:
The term proximal means closer to the point of attachment of a limb to the trunk. Since the hip is the point of attachment for the leg, the knee is closer to the hip than the ankle is. Therefore, the knee is proximal to the ankle. This is a standard anatomical relationship used to describe the relative positions of structures along the limbs.
Why Other Options Are Wrong:
distal
This is incorrect because distal means farther from the point of attachment. The ankle is distal to the knee, not the other way around.
posterior
This is incorrect because posterior means toward the back of the body. While useful in other contexts, it does not describe the knee’s position relative to the ankle.
medial
This is incorrect because medial means closer to the midline of the body. Both the knee and ankle are on the same vertical axis of the leg, so medial is not the correct term.
lateral
This is incorrect because lateral means farther from the midline of the body. The knee and ankle are aligned vertically, so lateral does not describe their relative relationship.
Which of the following organs' cells would have an abundant number of peroxisomes to detoxify alcohol?
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liver and kidney
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blood cells
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ovaries and testes
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skin, hair, and nails
Explanation
whiplike, tail structures for cell movement
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flagella
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lysosomes
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cilia
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endoplasmic reticulum
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mitochondria
Explanation
Flagella are long, whiplike tail structures that propel a cell forward, allowing movement. In humans, the most well-known example is the sperm cell, which uses a single flagellum for locomotion. Flagella are made of microtubules arranged in a 9+2 pattern and powered by ATP-driven motor proteins, giving the cell motility.
type of cartilage with fibers visible; makes up external ear and epiglottis
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elastic
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hyaline
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fibro
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reticular
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areolar
Explanation
Correct Answer:
elastic
Explanation:
Elastic cartilage contains a dense network of visible elastic fibers in its matrix, making it both strong and highly flexible. This allows it to maintain shape while bending, which is essential for structures like the external ear (pinna) and the epiglottis. Elastic cartilage combines support with elasticity, making it distinct from other types of cartilage that focus more on strength or cushioning.
Why Other Options Are Wrong:
hyaline
This is incorrect because hyaline cartilage has a smooth, glassy appearance with few visible fibers. It provides support with some flexibility and is found in the nose, trachea, larynx, and at the ends of long bones.
fibro
This is incorrect because fibrocartilage contains thick bundles of collagen fibers, making it very strong and resistant to compression. It is found in intervertebral discs, pubic symphysis, and menisci, not in the external ear or epiglottis.
reticular
This is incorrect because reticular tissue is a type of connective tissue with reticular fibers forming a soft framework in lymphoid organs like the spleen and lymph nodes. It is not cartilage.
areolar
This is incorrect because areolar tissue is a loose connective tissue that provides cushioning and support under epithelial layers. It does not form cartilage and is unrelated to the ear or epiglottis.
Which tissue has several layers of cells with flat cells on top?
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stratified squamous
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simple squamous
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pseudostratified
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transitional
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adipose
Explanation
Correct Answer:
stratified squamous
Explanation:
Stratified squamous epithelium is composed of multiple layers of cells, with the deepest layers being cuboidal or columnar and the surface layers flattened (squamous). This arrangement provides protection against friction, abrasion, and pathogens. It is commonly found in areas subject to wear and tear, such as the skin, mouth, esophagus, and vagina. The multiple layers make it durable, while the flat surface cells are easily shed and replaced.
Why Other Options Are Wrong:
simple squamous
This is incorrect because simple squamous epithelium is only a single layer of flat cells. It functions in diffusion and filtration, not protection through multiple layers.
pseudostratified
This is incorrect because pseudostratified epithelium appears layered but is actually a single layer with nuclei at different levels. It is often ciliated and found in the respiratory tract, not layered with flat cells on top.
transitional
This is incorrect because transitional epithelium has multiple layers of cells that change shape depending on stretching. The surface cells can look rounded or flat, but this is different from the consistently flat surface cells of stratified squamous.
adipose
This is incorrect because adipose tissue is a type of connective tissue specialized for storing fat. It is not epithelial tissue and does not have layers of flat surface cells.
The serous membrane that lines the abdominopelvic cavity is
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parietal peritoneum
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visceral peritoneum
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parietal pleura
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visceral pleura
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parietal pericardium
Explanation
Correct Answer:
parietal peritoneum
Explanation:
The parietal peritoneum is the correct serous membrane lining the walls of the abdominopelvic cavity. The term “parietal” always indicates the membrane portion attached to and lining the cavity wall. It secretes serous fluid, which allows smooth movement of organs against each other and the body wall. This reduces friction and protects tissues. It is clinically significant because inflammation of this membrane, called peritonitis, can cause severe pain and systemic complications.
Why Other Options Are Wrong:
visceral peritoneum
This is incorrect because the visceral peritoneum covers the surface of abdominal organs, not the cavity walls. Its role is to protect and support the organs and connect them via mesenteries, but it does not line the abdominopelvic cavity.
parietal pleura
This is incorrect because the parietal pleura lines the thoracic cavity around the lungs. It has nothing to do with the abdominal or pelvic cavities. Its function is specific to the respiratory system, not the digestive or reproductive organs.
visceral pleura
This is incorrect because the visceral pleura directly covers the lungs and allows them to glide smoothly during respiration. It is not present in the abdominopelvic cavity and therefore does not line its walls.
parietal pericardium
This is incorrect because the parietal pericardium lines the pericardial cavity surrounding the heart. Its role is to protect and anchor the heart, but it has no connection to the abdominopelvic cavity.
protein fibers that are the strongest, thickest, and most abundant in connective tissue
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collagen
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elastic
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reticular
Explanation
Correct Answer:
collagen
Explanation:
Collagen fibers are the strongest, thickest, and most abundant protein fibers in connective tissue. They provide high tensile strength, allowing tissues like tendons, ligaments, and bone to resist stretching and tearing. Collagen makes up about one-third of the body’s protein content, reflecting its importance in structural support. These fibers are slightly flexible but primarily designed to give durability and strength to connective tissues throughout the body.
Why Other Options Are Wrong:
elastic
This is incorrect because elastic fibers are thinner and provide flexibility and the ability to stretch and recoil. They are abundant in tissues like skin, lungs, and blood vessels, but they are not the strongest or most abundant fibers.
reticular
This is incorrect because reticular fibers form delicate, branching networks that support soft tissues such as lymph nodes and the spleen. They are thin and specialized for structural support, not for strength and thickness like collagen.
refers to the part of a phospholipid that is hydrophobic
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water-loving head that faces the intracellular and extracellular fluids
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water-loving tails that face the intracellular and extracellular fluids
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water-fearing tails that form the middle of the bilayer
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water-loving tails that form the middle of the bilayer
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water-fearing tails that face the intracellular and extracellular fluids
Explanation
The hydrophobic part of a phospholipid is its fatty acid tails, which are nonpolar and "water-fearing." These tails point inward toward each other, away from water, forming the inner core of the bilayer. This arrangement is essential for the membrane’s selective permeability, creating a barrier that prevents free passage of water-soluble substances.
has fibers that are closely packed together; arranged in parallel bundles with fibroblasts in rows; resists pulling in one direction; makes up tendons and ligaments
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dense regular
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dense irregular
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adipose
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areolar
Explanation
Correct Answer:
dense regular
Explanation:
Dense regular connective tissue is composed of collagen fibers that are tightly packed and aligned in parallel bundles. Fibroblasts are arranged in rows between the fibers. This arrangement allows the tissue to resist tension and pulling in a single direction, making it ideal for tendons (which connect muscle to bone) and ligaments (which connect bone to bone). Its highly ordered structure provides strength but limited flexibility.
Why Other Options Are Wrong:
dense irregular
This is incorrect because dense irregular connective tissue has collagen fibers arranged irregularly in multiple directions. It provides strength in many directions, such as in the dermis of the skin, not just in one direction.
adipose
This is incorrect because adipose tissue is a loose connective tissue specialized for fat storage, cushioning, and insulation. It does not contain parallel bundles of collagen fibers or resist pulling forces.
areolar
This is incorrect because areolar tissue is a loose connective tissue with loosely arranged fibers in a gel-like matrix. It provides support, elasticity, and packing material but does not resist strong unidirectional pulling like dense regular connective tissue.
top thin layer of dermis that contains capillary loops, Meissner's corpuscles, papillae, and free nerve endings
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papillary
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reticular
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subcutaneous
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hypodermis
Explanation
Correct Answer:
papillary
Explanation:
The papillary layer is the thin, superficial layer of the dermis made of areolar connective tissue. It contains dermal papillae, which project into the epidermis and house capillary loops that supply nutrients. This layer also contains sensory receptors such as Meissner’s corpuscles (touch receptors) and free nerve endings for pain and temperature. Its loose connective tissue and papillae help anchor the epidermis to the dermis and increase the surface area for exchange.
Why Other Options Are Wrong:
reticular
This is incorrect because the reticular layer is the deeper dermal layer composed of dense irregular connective tissue. It contains sweat glands, sebaceous glands, blood vessels, hair follicles, and Pacinian corpuscles, not papillae with Meissner’s corpuscles.
subcutaneous
This is incorrect because the subcutaneous layer is beneath the dermis and is made mostly of adipose and areolar tissue. It functions in insulation and cushioning but is not part of the dermis.
hypodermis
This is incorrect because hypodermis is another name for the subcutaneous layer. It is not a layer of the dermis and does not contain dermal papillae or Meissner’s corpuscles.
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