Nokea
Where do spermatozoa develop in men?
- A. Seminiferous tubules
- B. Vas deferens
- C. Ejaculatory ducts
- D. Bulbourethral glands
Correct Answer: A
Rationale: Spermatozoa develop within the seminiferous tubules of each testis. These tubules are responsible for the production of sperm through a process called spermatogenesis. While the vas deferens, ejaculatory ducts, and bulbourethral glands play essential roles in the transport and release of sperm, they are not involved in the actual development of sperm.
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Which of the following hormones decreases the concentration of blood glucose?
- A. insulin
- B. glucagon
- C. growth hormone
- D. glucocorticoids
Correct Answer: A
Rationale: Insulin is the hormone responsible for decreasing the concentration of blood glucose levels by promoting the uptake and storage of glucose in cells. When blood glucose levels rise, insulin is released to help cells absorb excess glucose, thereby lowering its concentration in the bloodstream. Glucagon, growth hormone, and glucocorticoids, in contrast, all play roles in increasing blood glucose levels through different mechanisms.
Which mineral is responsible for muscle contractions?
- A. Chloride
- B. Sodium
- C. Calcium
- D. Magnesium
Correct Answer: C
Rationale: Calcium is the mineral responsible for muscle contractions. When a muscle receives a signal from the nervous system, calcium is released within the muscle cells, allowing the muscle fibers to contract. This process is essential for various bodily functions, including movement, digestion, and heart function.
Why are skeletal muscles also called voluntary muscles?
- A. They are under conscious control.
- B. They are attached to the skeleton.
- C. They use ATP to energize contraction.
- D. They are striated in appearance.
Correct Answer: A
Rationale: Skeletal muscles are referred to as voluntary muscles because they are under conscious control. This means that individuals can decide when to contract these muscles, enabling voluntary movements such as walking, running, and lifting objects. Choice A is the correct answer as it reflects the defining characteristic of voluntary control over skeletal muscles. Choices B, C, and D are not the primary reasons for why skeletal muscles are termed voluntary muscles as they do not relate directly to the conscious control aspect.
An over-production of cerumen can accumulate in which area?
- A. In the nose.
- B. On the eyelids and eyes.
- C. In the external ear canals.
- D. On the teeth
Correct Answer: C
Rationale:
In what area of the body would you expect to find an especially thick stratum corneum?
- A. Back of the hand
- B. Heel of the foot
- C. Abdomen
- D. Over the shin
Correct Answer: B
Rationale: The stratum corneum, the outermost layer of the epidermis, is composed of dead skin cells. Areas that are subjected to constant pressure or friction, such as the heel of the foot, tend to have a thicker stratum corneum as a protective mechanism against wear and tear. Therefore, an especially thick stratum corneum would be expected on the heel of the foot, making it the correct answer.