Select the mechanism below that is not involved in the flow of lymph through the lymphatic vessels
A) milking action of skeletal muscles
B) pressure changes in the thorax that occur during breathing
C) pumping action of the heart
Answer: C
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The regulation of awake-asleep cycles appears to involve an interplay between brain stem nuclei that use different neurotransmitters. The one that favors alertness is ________ and the other promoting deep sleep is ________
A) acetylcholine; serotonin B) serotonin; norepinephrine C) norepinephrine; serotonin D) dopamine; GABA E) glutamate; serotonin
Acetylcholine exerts its effect by
A. stimulating the motor neuron's synaptic knob. B. binding to receptors at the motor end plate. C. activating acetylcholinesterase. D. allowing calcium to enter the cell.
Birds ________ to clean feather debris and distribute oil from the uropygial gland
Fill in the blank(s) with correct word
Which heart chamber has the thickest muscular walls?
a. right ventricle b. right atrium c. left ventricle d. left atrium