Blood flow during ventricular filling is most dependent upon ________.
A. pressure changes
B. pumping actions
C. concentration gradients
D. the conduction system
Answer: A. pressure changes
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Kinesin-associated proteins have the ability to do all of the following EXCEPT
A) Affect kinetics of movement. B) Affect the type of cargo binding to kinesin. C) Affect the isoforms used to build kinesin. D) Affect the ATP hydrolysis rate.
Which of the following examples listed below illustrates homeostasis maintained by a negative feedback?
A) Production of vitamin D initiated by the suns UV light striking the skin. B) Formation of cerumen wax to deter insects from entering the ear. C) Changes in the response of the hair follicle to dihydrotestosterone (DHT). D) Thickening of epidermis to form a callus in places where the skin is exposed to friction.
________ cells constrict the afferent arterioles and secrete renin.
Fill in the blank(s) with the appropriate word(s).
Which of these is a major difference between smooth muscle and skeletal muscle?
A. Only skeletal muscle requires increased calcium ion concentration in the cytosol for contraction. B. Only skeletal muscle has both actin and myosin. C. Myosin is the main regulatory protein in smooth muscle. D. Myosin is the main regulatory protein in skeletal muscle. E. Skeletal muscle usually exhibits spontaneous activity, while smooth muscle cannot contract spontaneously.