The thickest myocardium is found in the walls of the _____. Why?
A) right atrium; because it must pump against the high pressure of incoming venous blood from the vena cavae.
B) left atrium; because it must pump into the high pressure of the left ventricle.
C) right ventricle; because it must pump into the high resistance of the pulmonary circulation.
D) left ventricle; because it pumps into the systemic circulation and must push blood through the whole body.
Answer: D) left ventricle; because it pumps into the systemic circulation and must push blood through the whole body.
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The chest is superior to the head.
Answer the following statement true (T) or false (F)
What is the sequence of events in the transmission of an impulse through the heart muscle?
a: AV node b: AV bundle c: SA node d: Through the atria e: Through the ventricles f: Bundle branches g: Purkinje fibers A. c, d, a, b, f, g, e B. d, b, a, c, f, g, e C. b, a, d, c, f, g, e D. f, g, d, c, b, a, e E. c, d, a, f, b, g, e
Your grandmother steps off a sidewalk, then collapses. She later tells you she has a "broken hip." However, having studied anatomy, you know it is probably which structure that has been fractured?
A. The acetabulum B. The femoral shaft C. The obturator foramen D. The femoral neck
Which of the following is NOT part of the organ of Corti?
A. Hair cells with sensory fibers B. Basilar membrane C. Tectorial membrane D. Vestibular membrane