The free edges of the atrioventricular valves are attached to fibers called ____________________.
chordae tendineae
liberated fibers
pectinate muscles
papillary muscles
trabecula carnae
chordae tendineae
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Concentric contractions occur when
A. the muscle produces increasing tension as it shortens. B. the tension and length of the muscle remain constant during a contraction. C. the muscle produces tension while the length of the muscle increases. D. tension in a muscle is maintained while the muscle increases in length. E. isometric contractions occur.
A direct connection between an arteriole and a venule without an intervening capillary bed is a/an ________.
A. arterial capillary B. arteriovenous anastomosis C. metarteriole D. venous sinus
You are a surgeon who is implanting a medical device in the brain of a patient with a persistent tremor in his right hand that obstructs his ability to write. Where do you implant the device that has been shown to dampen these tremors?
A. In the brainstem pathways because they control postural and most other coordinated body movements. B. In the left somatosensory cortex because it initiates motor activity. C. In the left corticospinal motor pathways because they control most fine, discrete muscle activity. D. In the left corticospinal pathway or the left sensorimotor cortex that control movements of limbs on the right side of the body.
The structure that produces a thin, milk-colored fluid that composes about 30% of the seminal fluid volume is the:
a. seminal vesicles b. prostate gland c. bulbourethral glands d. seminiferous tubules