term1 Definition1term2 Definition2term3 Definition3
Please sign in to your Google account to access your documents:
The two subdivisions of the autonomic division of the nervous system are ________.
the sympathetic and the parasympathetic divisions
A. the sympathetic and the parasympathetic divisions
B. the preganglionic and the postganglionic divisions
C. the somatic motor division and the autonomic division
D. the somatic division and the voluntary division
The adrenal medulla is important to the sympathetic branch of the autonomic nervous system because ________.
it is a source of catecholamines.
A. it releases epinephrine and norepinephrine directly into a chemical synapse
B. it is a source of catecholamines.
C. it is a source of acetylcholine
D. it is considered a modified parasympathetic ganglion
Which division of the autonomic nervous system contains adrenergic neurons?
Only the sympathetic division of the nervous system
A. Only the sympathetic division of the nervous system
B. Only the parasympathetic division of the nervous system
C. Both divisions of the nervous system
D. Neither division of the nervous system
Which of the following statements is FALSE?
Activation of alpha receptors opens Na+ channels in the membrane.
A. β2 receptors are not innervated by sympathetic neurons and are more sensitive to epinephrine, delivered via the blood.
B. Activation of alpha receptors opens Na+ channels in the membrane.
C. β1 receptors respond well to both epinephrine and norepinephrine.
D. Monoamine oxidase is the main enzyme responsible for the degradation of catecholamines.
Which of the following statements is true?
Some blood vessels contain alpha adrenergic receptors that cause vasoconstriction in the presence of epinephrine, whereas others have β2adrenergic receptors that cause vasodilation in the presence of epinephrine.
A. Dual innervation is present in all visceral organs and glands; one branch enhances the function or secretion, while the other branch inhibits it.
B. The chemical messenger always determines the effector response.
C. The beating of the heart is regulated only by the sympathetic division.
D. Some blood vessels contain alpha adrenergic receptors that cause vasoconstriction in the presence of epinephrine, whereas others have β2adrenergic receptors that cause vasodilation in the presence of epinephrine.
If a somatic motor neuron fires an action potential, then ________.
the response is always excitatory
B. acetylcholinesterase is the neurotransmitter released from the axon terminal
C. the response is always excitatory
D. norepinephrine is released from the axon terminal
The motor end plate is ________.
a folded area of muscle cell membrane with nicotinic ACh receptors clustered at the top of each fold
A. the same as the neuromuscular junction
B. a folded area of muscle cell membrane with nicotinic ACh receptors clustered at the top of each fold
C. formed by the membrane of enlarged axon terminals or boutons that lie on the surface of skeletal muscle cells
D. the same as the synaptic cleft
Aliens on Planet X have a hormone that has a structure similar to epinephrine. Scientists are calling it X-epinephrine and would like to see if it has the same effects as epinephrine does in humans. Upon administration to humans, which of the following results would best demonstrate that X-epinephrine is an epinephrine agonist?
The subjects' blood pressure falls. (Arterioles dilate.)
A. The subjects' blood pressure rises. (Arterioles constrict.)
B. The subjects have high blood glucose levels. (Insulin secretion is inhibited.)
C. The subjects' blood pressure falls. (Arterioles dilate.)
D. The subjects have trouble breathing. (Bronchioles in the lungs constrict.)
If the scientists find that X-epinephrine causes pupil dilation, localized sweating, increased blood pressure, and high blood glucose levels in the subjects, what might they conclude about the nature of X-epinephrine?
It behaves like norepinephrine and acts on alpha receptors.
A. It behaves like norepinephrine and acts on alpha receptors.
B. It behaves like acetylcholine and acts on muscarinic receptors.
C. It behaves like glutamate and acts on AMPA receptors.
D. It behaves like acetylcholine at the neuromuscular junction.
If a person has a genetic disorder that caused him/her to not produce norepinephrine, which type of tissue would be affected the least?
Skeletal muscle
A. Skeletal muscle
B. Coronary arteriole
C. Afferent arteriole muscle
D. Juxtaglomerular cells
Need help typing ? See our FAQ (opens in new window)
Please sign in to create this set. We'll bring you back here when you are done.
Discard Changes Sign in
Please sign in to add to folders.
Sign in
Don't have an account? Sign Up »
You have created 2 folders. Please upgrade to Cram Premium to create hundreds of folders!