What roles do testosterone, LH, and FSH have on sperm development?
What will be an ideal response?
Answer: Testosterone is responsible for descent of the testes, which is critical to maintaining the optimum temperature for sperm production. Testosterone stimulates sperm production and is essential for sperm maturation. Luteinizing hormone (LH) promotes development of the interstitial cells of the testes. Its actions are synergistic to the follicle stimulating hormone (FSH). FSH stimulates the supporting cells of the seminiferous tubules, triggers the secretion of testosterone in the Leydig cells, acts on the Sertoli cells of the testes to stimulate spermatogenesis and nourishes the sperms produced by the testes.
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As the bolus of food enters the oropharynx during swallowing, all of the following actions occur except:
A) the infrahyoid muscles act to depress the larynx. B) the oropharynx is closed off from the nasopharynx. C) the oropharynx is shortened. D) the soft palate is elevated. E) the constrictor muscles contract.
Early in development, where do the first blood cell precursors form?
A. The yolk sac B. The spleen C. The liver D. The bone marrow E. The heart
Where is the primary gustatory cortex located?
What will be an ideal response?
Classify these joints to the correct structural classification: sutures, syndesmoses, and gomphoses
A) fibrous B) cartilaginous C) synovial D) amphiarthrosis