Which of the following describes meiosis as it takes place in the testes?
Spermatozoa
Spermiogenesis
Spermatogenesis
Spermatocytes
The Correct Answer is C
a. Spermatozoa: These are the mature male gametes (sperm cells) that result from spermatogenesis but do not describe the process of meiosis itself.
b. Spermiogenesis: This is the final stage of spermatogenesis, where spermatids undergo morphological changes to become mature spermatozoa.
c. Spermatogenesis: This is the process that includes both meiosis and subsequent maturation steps, resulting in the formation of spermatozoa. It involves the production of haploid sperm cells from diploid germ cells.
d. Spermatocytes: These are the cells that undergo meiosis during spermatogenesis. Primary spermatocytes undergo the first meiotic division to form secondary spermatocytes, which then undergo the second meiotic division to produce spermatids.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
a. Mouth: The mouth is primarily responsible for the mechanical breakdown of food and the beginning of starch digestion via salivary amylase, but it is not a major site of nutrient absorption.
b. Small intestine: The small intestine is the primary site for nutrient absorption. The majority of carbohydrates, proteins, fats, vitamins, and minerals are absorbed here through its extensive surface area provided by villi and microvilli.
c. Large intestine: The large intestine primarily absorbs water and electrolytes. It is not a major site for nutrient absorption.
d. Stomach: The stomach is mainly involved in the mechanical and chemical breakdown of food, particularly proteins, but only a small amount of nutrients (e.g., alcohol, some drugs) are absorbed here.
Correct Answer is A
Explanation
a. Acetylcholine: This is the primary neurotransmitter at neuromuscular junctions. It binds to receptors on muscle cells (specifically nicotinic acetylcholine receptors) and triggers an action potential, leading to muscle contraction.
b. Calcium: While calcium ions are essential for muscle contraction, they are not neurotransmitters. Instead, they play a role in the release of acetylcholine from the nerve terminal and in the contraction process within muscle cells.
c. Adenosine triphosphate (ATP): ATP is the primary energy carrier in cells but is not a neurotransmitter. It is crucial for muscle contraction, as it provides the energy for various steps in the contraction cycle.
d. Sodium: Sodium ions are involved in generating action potentials and depolarizing muscle cells, but they are not neurotransmitters.
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