Bio 201 Human Anatomy and Physiology

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Free Bio 201 Human Anatomy and Physiology Questions

1.

type of cartilage with fibers visible; makes up external ear and epiglottis

  • elastic

  • hyaline

  • fibro

  • reticular

  • 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.


2.

What types of fibers are arranged in planes in the dermis forming invisible cleavage lines?

  • collagen

  • reticular

  • elastic

Explanation

Correct Answer:

collagen

Explanation:

Collagen fibers are the primary structural fibers in the dermis. They are arranged in parallel bundles or planes, creating cleavage (tension) lines in the skin. These lines represent the natural orientation of collagen fibers and are important in surgery: incisions made parallel to cleavage lines heal faster and with less scarring. Collagen provides strength and resilience to the skin, helping it withstand stretching and tearing forces.

Why Other Options Are Wrong:

reticular

This is incorrect because reticular fibers are thin, branching fibers that form supportive networks in organs such as the spleen and lymph nodes. They do not determine cleavage lines in the dermis.

elastic

This is incorrect because elastic fibers provide flexibility and stretch to the skin, allowing it to return to its original shape. While important for skin elasticity, they are not responsible for forming cleavage lines.


3.

fibers are closely packed but randomly arranged to resist pulling in several directions; makes up dermis of skin

  • dense irregular

  • dense regular

  • areolar

  • transitional

  • cartilage

Explanation

Correct Answer:

dense irregular

Explanation:

Dense irregular connective tissue has collagen fibers that are thick, closely packed, and arranged in random directions. This irregular arrangement allows the tissue to resist tension and pulling forces from multiple directions, making it ideal for areas exposed to stress from different angles, such as the dermis of the skin, joint capsules, and organ coverings. Its strength and flexibility help protect underlying tissues and structures.

Why Other Options Are Wrong:

dense regular

This is incorrect because dense regular connective tissue has collagen fibers arranged in parallel bundles, providing great strength but only in one direction. It is found in tendons and ligaments, not the dermis.

areolar

This is incorrect because areolar tissue is a loose connective tissue with loosely arranged fibers. It provides support and elasticity but lacks the dense, random collagen structure necessary to resist multi-directional pulling.

transitional

This is incorrect because transitional epithelium is not connective tissue. It is a specialized epithelial tissue that lines the urinary bladder, ureters, and part of the urethra, allowing stretching.

cartilage

This is incorrect because cartilage is a supportive connective tissue with a firm matrix containing chondrocytes in lacunae. It provides cushioning and flexibility but does not resist multi-directional pulling forces like dense irregular connective tissue.


4.

glands that release their secretions by pinching off part of their cells which become the secretion (armpit sweat glands, mammary glands, wax glands)

  • apocrine

  • holocrine

  • merocrine

Explanation

Correct Answer:

apocrine

Explanation:

Apocrine glands secrete their products by pinching off a portion of the cell, which becomes part of the secretion. This method of secretion involves partial loss of cytoplasm along with the secretory product. Examples include certain sweat glands in the armpits, mammary glands, and ceruminous (earwax) glands. This secretion is thicker and often associated with specialized functions, such as scent release or milk production.

Why Other Options Are Wrong:

holocrine

This is incorrect because holocrine glands release secretions when entire cells rupture and disintegrate, releasing their contents. An example is sebaceous (oil) glands in the skin, not sweat or mammary glands.

merocrine

This is incorrect because merocrine glands secrete their products through exocytosis without losing any part of the cell. Examples include salivary glands and most sweat glands (eccrine type). They do not pinch off parts of the cell.


5.

Which structure is found on the internal and external surfaces of the cell membrane to serve in recognition, reception, adhesion?

  • peripheral proteins

  • integral proteins

  • phospholipids

  • cholesterol

  • DNA

Explanation

Correct Answer:

peripheral proteins

Explanation:

Peripheral proteins are located on the internal and external surfaces of the plasma membrane. They play key roles in cell recognition, signaling, and adhesion by interacting with other cells or the extracellular matrix. They are not embedded deeply in the bilayer but are loosely attached, making them versatile for receptor and recognition functions.

Why Other Options Are Wrong:

integral proteins

This is incorrect because integral proteins span the membrane and are mainly involved in transport (channels and carriers) or structural anchoring, not specifically recognition and adhesion on the surface.

phospholipids

This is incorrect because phospholipids form the bilayer itself, providing a structural barrier. They are not responsible for recognition or adhesion.

cholesterol

This is incorrect because cholesterol helps regulate membrane fluidity and stability, but it is not involved in recognition or adhesion.

DNA

This is incorrect because DNA is found in the nucleus (or nucleoid in prokaryotes). It contains genetic information but has no role on the cell membrane surface.


6.

stacks of pancake sacs that package and process materials

  • Golgi apparatus

  • endoplasmic reticulum

  • microfilaments

  • lysosomes

  • microtubules

Explanation

The Golgi apparatus is made of stacked, flattened membrane sacs (cisternae) resembling pancakes. It functions as the cell’s packaging and processing center. Proteins and lipids from the endoplasmic reticulum are modified, sorted, and packaged into vesicles for transport to their destinations, such as the plasma membrane, lysosomes, or secretion outside the cell.
7.

Which directional term would complete the sentence correctly?
The knee is—---------------- to the ankle.

  • proximal

  • distal

  • posterior

  • medial

  • 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.


8.

protein fibers that are the strongest, thickest, and most abundant in connective tissue

  • collagen

  • elastic

  • 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.


9.

secrete mucus

  • goblet cells

  • keratin

  • serous membranes

  • mast cells

  • adipose cells

Explanation

Correct Answer:

goblet cells

Explanation:

Goblet cells are specialized epithelial cells that secrete mucus, a thick fluid made of mucins and water. Mucus lubricates and protects the linings of the respiratory, digestive, and reproductive tracts. In the respiratory system, mucus traps dust and microbes, while in the digestive tract it protects the lining from digestive enzymes and acids. Goblet cells are critical for maintaining moist, protected surfaces.

Why Other Options Are Wrong:

keratin

This is incorrect because keratin is a structural protein found in skin, hair, and nails. It provides strength and waterproofing but is not secreted as mucus.

serous membranes

This is incorrect because serous membranes secrete a thin, watery serous fluid to reduce friction between organs. They do not produce mucus.

mast cells

This is incorrect because mast cells release histamine and other chemicals during inflammation and allergic responses. They are immune cells, not mucus-secreting cells.

adipose cells

This is incorrect because adipose (fat) cells store lipids for energy, cushioning, and insulation. They do not secrete mucus.


10.

The study of the structure and location of body parts is

  • anatomy

  • physiology

  • histology

  • cytology

  • complementarity

Explanation

Correct Answer:

anatomy

Explanation:

Anatomy is the branch of biology concerned with the structure and organization of living organisms. In human anatomy, it specifically refers to the study of the body’s structures and the relationships between them, such as bones, muscles, organs, and systems. Anatomy can be studied at different levels, including gross anatomy (visible structures) and microscopic anatomy (using microscopes). It focuses on what body parts are and where they are located, forming the foundation for understanding physiology.

Why Other Options Are Wrong:

physiology

This is incorrect because physiology is the study of the functions and processes of body parts, not their structures or locations. It explains how the body works.

histology

This is incorrect because histology is the microscopic study of tissues. While it is part of anatomy at a detailed level, the broader study of body structure and location is called anatomy.

cytology

This is incorrect because cytology is the study of cells and their internal structures. It is more specific than anatomy and focuses on the smallest units of life.

complementarity

This is incorrect because complementarity of structure and function is a principle in anatomy and physiology stating that form and function are interrelated. It is not itself the name of the science studying structures.


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