Out of the 200 million ejaculated sperm, only about ________ reach the vicinity of the egg.
A. 20,000
B. 2000
C. 2
D. 200
E. 20
Answer: D
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Why does an adult not have as many bones as a child?
A. Osteoporosis leads to bone loss with age. B. Some separate bones gradually fuse with age. C. Many bones are replaced by cartilage with age. D. Bones are reabsorbed with age. E. Osteoclast activity overcomes osteoblast activity with age.
Which type of attachment proteins attach cells to extracellular molecules?
A. Adherins B. Ligands C. Integrins D. Cadherins
The brain-testicular axis ________.
A) is the tight relationship between the cortex and the control of testicular function B) involves FSH and LH release C) involves posterior pituitary release of regulating hormones D) involves a positive feedback loop control of spermatogenesis
The ________ provides the principal link between the nervous and endocrine systems
A) cerebellum B) medulla oblongata C) cerebrum D) pons E) hypothalamus