Which structure does blood pass through immediately before it enters the left ventricle?
A. semilunar valve
B. aorta
C. left atrium
D. atrioventricular valve
E. vena cava
Answer: D
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The effector for the Lac repressor protein is:
A. lactose. B. allolactose. C. glucose. D. ?-galactosidase.
The Staphylococcaceae staphylococcus that is more likely to cause uncomplicated urinary tract infections in nonhospitalized hosts, especially sexually active young women, is:
a. S. saprophyticus. b. S. aureus. c. S. epidermidis. d. S. intermedius.
____ is/are considered to be the ancestor to both Homo neanderthalensis and Homo sapiens
a. Homo habilis b. Paranthropus loisei c. Homo floresiensis d. Denisovians e. Homo erectus
Of these events, the first to occur when a motor neuron stops sending an impulse to a muscle is _____.
A. the pumping of calcium ions out of the cytoplasm and back into the sarcoplasmic reticulum B. the release of myosin heads from the thin filament C. thin filaments slide back to their relaxed positions D. proteins on the thin filaments block actin's myosin-binding sites E. all of these events occur simultaneously