Vasoconstriction:
A. decreases peripheral resistance
B. increases arterial blood pressure
C. is caused by relaxation of smooth muscle in the blood vessel walls
D. decreases cardiac output
Answer: B. increases arterial blood pressure
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Which of the following is incorrect pertaining to the inguinal canal?
A) It transmits an indirect inguinal hernia. B) It is traversed prenatally by the processes vaginalis, which later occludes. C) It is traversed prenatally by the primordial testis. D) Its roof is formed by the inguinal ligament. E) Its superficial opening is the superficial (external) inguinal ring.
Presynaptic inhibition is brought about when dendrites of a postsynaptic neuron alter the signals sent from an axon terminal of a presynaptic neuron
Indicate whether the statement is true or false
Vasodilation in skeletal and cardiac muscle tissue results from the signal molecule _____ binding to ______ receptors
A. Epinephrine; beta 2 B. Epinephrine; alpha C. Acetylcholine; beta 2 D. Acetylcholine; alpha
What role do the tonsils play in the respiratory system?
A) Tonsils produce mucus which drains into the nasal cavities. B) Tonsils humidify and warm incoming air. C) Tonsils moisten the air entering the respiratory passageways. D) Tonsils protect the body from infection. E) Tonsils sweep contaminated mucus toward the throat.