Which joint is a synchondrosis?
A) Sternocostal
B) Interphalangeal
C) Intertarsal
D) Intervertebral
Answer: A
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Sympathetic innervation of the hearta: increases the heart rate.b: decreases the heart rate.c: increases the force of contractions.d: decreases the force of contractions.e: has no effect on contraction force.
A. b, d B. a, d C. a, e D. b, e E. a, c
The bending movements of cilia and flagella
a. are associated with microtubules and kinesin b. involve the alternate assembly and disassembly of actin filaments c. are produced when dynein motors pull adjacent microtubule doublets past each other d. involves dynein action on microfilaments e. involves myosin action on intermediate filaments
Which of the following is the function of the cremaster muscle?
A. Divides the scrotum into two compartments B. Forms a tube to carry sperm C. Temperature regulation D. None of these are correct.
The opening and closing of the heart valves is caused by
A. contraction and relaxation of papillary muscles that pull on heart strings. B. pressure changes of alternating contraction and relaxation during the cardiac cycle. C. contraction of the smooth muscle in the walls of the great vessels leaving the heart. D. action potentials within the cusps of the valves.