What is the primary role of testosterone in males?

Correct Answer: B

Rationale: The correct answer is B: Control the development of male secondary sexual characteristics. Testosterone plays a crucial role in the development of traits like facial hair, deep voice, muscle growth, and bone density in males. It is responsible for the physical characteristics that distinguish males from females. Choices A, C, and D are incorrect as testosterone primarily influences male sexual characteristics and does not directly impact sperm production, menstrual cycle regulation, or seminal fluid secretion.

Correct Answer: B

Rationale: The acrosome in sperm contains enzymes that help the sperm penetrate the outer layer of the egg during fertilization. This process is crucial for successful fertilization. The other choices are incorrect because: A) Energy for sperm comes from mitochondria, not the acrosome. C) Sperm are stored in the epididymis, not the acrosome. D) Genetic material is stored in the nucleus of the sperm cell, not the acrosome. Therefore, the correct answer is B as the acrosome's function is directly related to the penetration of the egg during fertilization.

Correct Answer: A

Rationale: The correct answer is A: Increased cervical mucus. During ovulation, the body produces more cervical mucus that becomes clear, stretchy, and slippery to facilitate sperm movement. This helps in the fertilization process. Lower body temperature and decreased estrogen levels are not typically signs of ovulation. Thickening of the uterine lining occurs during the menstrual cycle in preparation for a potential pregnancy, not specifically during ovulation.

Correct Answer: A

Rationale: The correct answer is A: Seminal vesicles. Seminal vesicles are responsible for producing seminal fluid, which makes up the majority of semen. They secrete a fluid rich in fructose and other nutrients to provide energy for sperm. The other choices are incorrect because the prostate gland produces a milky fluid that aids in sperm motility but is not the primary producer of seminal fluid. The epididymis stores and transports sperm, and the testes produce sperm cells through spermatogenesis, but neither of these structures is responsible for producing seminal fluid.

Correct Answer: C

Rationale: Correct Answer: C - Progesterone levels rise after ovulation to prepare the uterus for pregnancy. Rationale: 1. Progesterone is primarily produced by the corpus luteum after ovulation. 2. Progesterone helps thicken the endometrial lining to support embryo implantation. 3. Rising progesterone levels inhibit further ovulation. 4. If pregnancy occurs, progesterone is vital for maintaining the uterine lining. Summary: A: Incorrect - Ovulation occurs in the middle of the cycle during the follicular phase. B: Incorrect - The follicular phase is characterized by follicle development, not endometrial lining growth. D: Incorrect - FSH levels are high at the beginning of the cycle to stimulate follicle development, but decrease after ovulation.