Which of the following trend is NOT seen in and during evolution of vertebrate circulatory systems?
a. increasing use of closed circulatory systems
b. trend towards fewer hearts
c. ability to pump blood at higher pressure to pulmonary circuit than systemic circuit
d. evolution of hearts with more chambers
e. separation of pulmonary circulation from systemic circulation
Answer: c. ability to pump blood at higher pressure to pulmonary circuit than systemic circuit
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The blood vessel that supplies blood to the cerebral arterial circle from the posterior is the ________ artery
A) basilar B) middle cerebral C) vertebral D) internal carotid E) posterior cerebral
On entering the lungs, the primary bronchi divide to form smaller bronchi called ____ bronchi
a. segmental b. tertiary c. lobar d. terminal
Which event happens at the start of a cardiac cycle?
A) Atrial systole occurs. B) The P wave develops. C) Blood is ejected from the atrium. D) The SA node fires. E) Ventricular systole occurs.
Preganglionic and postganglionic fibers of the autonomic nervous system that innervate internal organs are collectively called
A) posterior rami. B) anterior rami. C) white rami. D) gray rami. E) sympathetic nerves.