The pontine respiratory neurons
A. are active only during inspiration.
B. play a role in switching between inspiration and expiration.
C. are active only during expiration.
D. is essential for respiratory rhythm.
E. are located in the medulla oblongata in the brain.
Answer: B
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The nurse cells of the seminiferous tubules do all of the following except
A) maintain the blood-testis barrier. B) support spermiogenesis. C) secrete inhibin. D) secrete testosterone. E) secrete androgen-binding protein.
Which of the following signs of hypovolemic shock is a relatively late sign?
A) increased heart rate B) cold, clammy skin C) rapidly falling blood pressure D) rapid, thready pulse
Permissiveness of hormones refers to the fact that
a. hormones permit cellular processes to occur b. hormones permit their target organs to function at the optimal rate c. in some instances an adequate amount of one hormone must be present for the full exertion of another hormone's effect, even though the first hormone itself does not directly elicit the response d. the nervous system through numerous neuroendocrine relationships permits the endocrine system to function e. the tropic hormones permit other endocrine glands to secrete their hormones
Antigen displaying cells are infected by pathogens so they can display the antigens
Indicate whether the statement is true or false.