Semen is
A. responsible for engorgement of erectile tissue of the penis.
B. sperm cells plus the secretions of accessory glands.
C. is composed only of sperm cells.
D. a vaginal secretion needed to activate sperm cells.
E. produced solely by the testis.
Answer: B
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Which of the following can act on receptors inside the target cell that directly activate specific genes?
A) growth hormone B) melatonin C) testosterone D) calcitonin
Continuous pressure that reduces blood supply to the skin can result in a(n)
A. urticaria. B. hirsutism. C. callus. D. decubitus ulcer.
Compliance refers specifically to the
a. effort required to stretch the lungs b. elasticity of the lung tissue c. energy requirements for an inspiration d. surface area of the alveoli e. volume of air moved per breathing cycle
Which of the following transport processes uses vesicles that fuse with the plasma membrane to secrete materials into the extracellular fluid?
a) endocytosis b) exocytosis c) facilitated diffusion d) osmosis e) Both endocytosis and exocytosis.