Mediated transport is required in order for glucose, amino acids, and fatty acids to pass into cells because none of these substances can diffuse through plasma membranes
Indicate whether the statement is true or false.
FALSE
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What is responsible for initiating contraction of smooth muscle?
a. Stimulation by motor neurons b. Inhibition of acetylcholinesterase c. Membrane potential drifting to threshold as a result of automatic changes in ion movement across the membrane d. Excitation of the gap junctions by a transmitter substance e. Stimulation by the autonomic nervous system
Which coronary vein receives blood from the posterior surfaces of the right atrium and ventricle?
A) small cardiac vein B) middle cardiac vein C) coronary sinus D) anterior cardiac vein E) posterior vein of left ventricle
Preganglionic neurons of the sympathetic nervous system originate in the:
A) collateral ganglion. B) gray rami communicantes. C) sympathetic chain ganglion. D) lateral horns of the spinal cord.
In which of the following organs are both chemoreceptors and baroreceptors associated with respiratory autonomic reflexes?
A) only lungs B) only aorta C) only carotid arteries D) both lungs and aorta E) both aorta and carotid arteries