Left ventricular contraction propels blood through which valve?
a. left atrioventricular (bicuspid) valve
b. Pulmonary valve
c. Aortic valve
d. Right atrioventricular (mitral) valve
c. Aortic valve
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Cardiac muscle cells do not need ________ to contract.
A) sodium B) calcium C) potassium D) ATP E) nervous stimulation
The space between the neuron and the muscle is the
A) Synaptic knob. B) Motor end plate. C) Motor unit. D) Synaptic cleft. E) M line
The ________ carry tears into the nasal cavity
A) ciliary ducts B) lacrimal canaliculi C) excretory ducts D) nasolacrimal ducts
Cell X has a resting potential of -80 mV. If a ____ opens and causes the potential to change 10 mV, the resulting potential will be ____
a. Na+ channel; -90 mV b. K+ channel; -70 mV c. Ca2+ channel; -70 mV d. Cl- channel; -70 mV e. Ca+2 channel; -90 mV