Anatomy and Physiology II (M8) Comprehensive Lecture Exam

Anatomy and Physiology II  (M8) Comprehensive Lecture Exam

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Free Anatomy and Physiology II (M8) Comprehensive Lecture Exam Questions

1.

Which of the following glands is anatomically located in the neck region, lust anterior to the larynx

  • Pancreas

  • pituitary gland

  • thyroid gland

  • Thymus

Explanation

Correct Answer: C. Thyroid gland

Explanation of the Correct Answer:

C. Thyroid gland

The thyroid gland is anatomically located in the anterior neck, just inferior (below) to the larynx (voice box) and anterior (in front of) the trachea. It is a butterfly-shaped endocrine gland composed of two lobes connected by a central isthmus. The thyroid produces essential hormones such as thyroxine (T4) and triiodothyronine (T3), which regulate the body’s metabolism, growth, and development. Because of its location and critical endocrine function, it is the gland most associated with the anterior neck region.

Why the Other Options Are Incorrect:

A. Pancreas

The pancreas is located in the abdominal cavity, specifically in the upper abdomen behind the stomach. It functions as both an endocrine gland (producing insulin and glucagon) and an exocrine gland (producing digestive enzymes), but it is not in the neck region.

B. Pituitary gland

The pituitary gland is located at the base of the brain, seated in the sella turcica of the sphenoid bone, directly beneath the hypothalamus. Though it is a crucial endocrine gland often called the "master gland," it is not located in the neck.

D. Thymus

The thymus is located in the upper anterior part of the chest (mediastinum), just behind the sternum and in front of the heart. It plays a major role in the development of the immune system, particularly in children, but it is not situated in the neck, and it lies inferior to the thyroid.


2.

Which structure regulates the transport of substances in and out of a cell?

  • Cell membrane

  • Nuclear membrane

  • Cell’s cytoplasm

  • Cell wall

Explanation

Correct Answer:

Cell membrane

Explanation:

The cell membrane, also known as the plasma membrane, is a selectively permeable barrier that surrounds the cell. It regulates the entry and exit of substances such as nutrients, waste, and ions. The membrane is made up of a lipid bilayer with embedded proteins that allow for transport, signaling, and structural support.

Why Other Options are Wrong:

Nuclear membrane

The nuclear membrane encloses the nucleus and regulates transport between the nucleus and the cytoplasm, not between the cell and its external environment.

Cell’s cytoplasm

The cytoplasm is the internal fluid of the cell where organelles are suspended. It does not regulate movement into or out of the cell.

Cell wall

The cell wall provides structural support and protection (mainly in plants, fungi, and some bacteria), but it is not responsible for the selective transport of materials in and out of the cell.


3.

When does the prenatal period begin?

  • Infancy

  • Conception

  • Gestation

  • Birth

Explanation

Correct Answer: B. Conception

Explanation of the Correct Answer:

B. Conception


The prenatal period begins at conception, which marks the fertilization of the egg by the sperm. This is the start of the development of the embryo and later the fetus, leading up to birth. The prenatal period is divided into three stages: the germinal stage (from conception to 2 weeks), the embryonic stage (from 2 weeks to 8 weeks), and the fetal stage (from 9 weeks until birth).

Why the Other Options Are Incorrect:

A. Infancy


Infancy refers to the stage after birth, starting from birth to approximately one year of age. It is not part of the prenatal period.

C. Gestation


Gestation refers to the entire period of pregnancy, from conception to birth. While it is closely related to the prenatal period, it is not the exact moment the prenatal period begins.

D. Birth


Birth marks the end of the prenatal period, not the beginning.


4.

What is the most abundant type of cell in the epidermis?

  • Keratinocytes

  • Melanocytes

  • Osteocytes

  • Chondroblasts

Explanation

Correct Answer:

Keratinocytes

Explanation:

Keratinocytes are the most abundant cells in the epidermis, comprising about 90% of the cells in this outermost skin layer. Their primary role is to produce keratin, a protective protein that makes the skin tough and waterproof. These cells originate in the basal layer and move upwards, undergoing changes that help form the skin's barrier against environmental damage, pathogens, and water loss.

Why Other Options are Wrong:

Melanocytes

Melanocytes are responsible for producing melanin, the pigment that gives skin its color. While they play a crucial role in protecting against UV radiation, they make up only about 5-10% of epidermal cells—not the majority.

Osteocytes

Osteocytes are mature bone cells found in the lacunae of compact bone. They are not found in the epidermis and have no role in skin structure or function.

Chondroblasts

Chondroblasts are cartilage-forming cells found in connective tissue, specifically in cartilage. They are unrelated to the epidermis and do not contribute to skin cell composition.


5.

The right lymphatic duct receives lymph from the:

  • Right arm

  • Right leg

  • Left leg

  • Left arm

Explanation

Correct Answer: A. Right arm

Explanation of the Correct Answer:

A. Right arm

The right lymphatic duct drains lymph from the right upper quadrant of the body, including the right arm, right side of the head and neck, and the right side of the chest. This duct ultimately empties into the right subclavian vein, where the lymph is reintroduced into the bloodstream.

Why the Other Options Are Incorrect:

B. Right leg


The right leg is not drained by the right lymphatic duct. Lymph from the right leg is collected by the thoracic duct, which drains lymph from the rest of the body, including the left side and the lower parts of the right side, like the right leg.

C. Left leg


The left leg is also drained by the thoracic duct, not the right lymphatic duct. The thoracic duct drains lymph from the left arm, left leg, and the left side of the chest, as well as the lower body (below the diaphragm) on both sides.

D. Left arm


The left arm is drained by the thoracic duct, which is the largest lymphatic vessel in the body and collects lymph from the left arm, the left side of the chest, and the lower body.


6.

Which blood type carries anti-A antibodies in the plasma?

  • A+

  • AB+

Explanation

Correct Answer: D. B-

Explanation of the Correct Answer:

D. B-

Blood type B- contains anti-A antibodies in the plasma because it has B antigens on the surface of the red blood cells and does not have A antigens. The anti-A antibodies will target any A antigens that enter the body. This is typical for individuals with blood type B, as they produce antibodies against the opposite A antigens in the plasma. Additionally, the - (negative) sign indicates the absence of the Rh factor, but this doesn't affect the presence of anti-A antibodies.

Why the Other Options Are Incorrect:

A. A+


Individuals with blood type A+ have A antigens on the surface of their red blood cells and produce anti-B antibodies in the plasma, not anti-A antibodies. They do not make antibodies against their own A antigens.

B. AB+


Individuals with blood type AB+ have both A and B antigens on their red blood cells, and they do not produce anti-A or anti-B antibodies in the plasma. This is because the presence of both antigens means the immune system recognizes both A and B antigens as "self."

C. A-


Blood type A- has A antigens on the red blood cells and produces anti-B antibodies in the plasma, but it does not produce anti-A antibodies. The absence of the Rh factor (negative sign) is also irrelevant to the presence of anti-A antibodies.


7.

If two alleles code for the same trait, such as blonde hair, they can be:

  • heterozygous

  • homologous

  • homozygous

  • autologous

Explanation

Correct Answer: C. Homozygous

Explanation of the Correct Answer:

C. Homozygous

When two alleles code for the same trait, such as blonde hair, and are identical (either both dominant or both recessive), the individual is said to be homozygous. For example, if the allele for blonde hair is represented by "bb," both alleles from the mother and father would be the same and would make the individual homozygous for that trait.

Why the Other Options Are Incorrect:

A. Heterozygous

Heterozygous means that the two alleles are different for a particular trait, such as having one allele for blonde hair ("b") and one for brown hair ("B"). This would not fit the scenario where both alleles are for the same trait (blonde hair).

B. Homologous

Homologous refers to chromosomes that are paired and have corresponding loci. It is not a term specifically used for describing alleles that code for the same trait.

D. Autologous

Autologous means originating from the same individual, but this term is not applicable when talking about alleles coding for traits.


8.

High levels of testosterone inhibit gonadotropin-releasing hormone (GnRH) by the hypothalamus.

  • True

  • False

  • True

  • False

Explanation

Correct Answer: A. True

Explanation of the Correct Answer:

A. True


High levels of testosterone do indeed inhibit the release of gonadotropin-releasing hormone (GnRH) by the hypothalamus. This is part of a negative feedback mechanism that helps regulate testosterone production. When testosterone levels are high, the hypothalamus senses this and decreases the secretion of GnRH. In turn, lower GnRH levels reduce the secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) from the anterior pituitary gland. This ultimately reduces the stimulation of the Leydig cells in the testes, decreasing the production of testosterone. This feedback loop helps maintain a balance in testosterone levels.

Why the Other Option Is Incorrect:

B. False


This statement is false because, as mentioned, high levels of testosterone do inhibit GnRH secretion through negative feedback. Therefore, "False" is incorrect.


9.

A sprain occurs when there is a tear in which structure?

  • Dermis

  • Muscle

  • Ligament

  • Cartilage

Explanation

Correct Answer:

Ligament

Explanation:

A sprain is an injury that involves the stretching or tearing of ligaments, which are the strong bands of connective tissue that connect bones to other bones at joints. This typically occurs when a joint is forced beyond its normal range of motion, such as during a fall or sudden twist. Sprains commonly affect the ankles, wrists, and knees.

Why Other Options are Wrong:

Dermis

The dermis is the inner layer of the skin that contains blood vessels, nerves, and glands. Damage to the dermis may occur in cuts or burns but is not involved in sprains.

Muscle

A muscle tear is called a strain, not a sprain. While both involve soft tissue injuries, strains affect muscles or tendons, not ligaments.

Cartilage

Cartilage is the firm yet flexible tissue found in joints, nose, and ears. It cushions joints but is not the structure that gets torn in a sprain. Injuries to cartilage are usually called cartilage tears or damage, not sprains.


10.

What is the response of cells in the collecting tubules in the nephrons when antidiuretic hormone (ADH) is secreted?

  • The tubules become impermeable to water.

  • Large quantities of dilute urine are formed.

  • Serum potassium retention increases.

  • Water is reabsorbed from the urinary filtrate.

Explanation

Correct Answer:

Water is reabsorbed from the urinary filtrate.

Explanation:

When ADH (antidiuretic hormone) is secreted, it acts on the cells of the collecting ducts in the kidneys to increase their permeability to water. This causes water to be reabsorbed from the filtrate back into the bloodstream, reducing urine volume and concentrating the urine. This mechanism helps maintain blood pressure and fluid balance, especially during dehydration or low blood volume.

Why Other Options are Wrong:

The tubules become impermeable to water.

This is incorrect because ADH increases the permeability of the collecting tubules to water. Saying they become impermeable contradicts the actual effect of ADH.

Large quantities of dilute urine are formed.

This describes what happens when ADH is absent or inhibited, not when it is secreted. In the presence of ADH, less urine is formed, and it is more concentrated.

Serum potassium retention increases.

ADH primarily affects water reabsorption and has minimal effect on potassium levels. Potassium balance is mainly regulated by aldosterone, not ADH.


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