Which structure labeled in the diagram contains the receptors that bind the inhaled chemicals?
a) H
b) G
c) I
d) E
e) L
c
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138) Excitatory neurotransmitters of the CNS usually act by opening ________ channels.
A) Ca2+ B) Cl- C) H+ D) K+ E) Na+
A neuron in the aorta detects oxygen content in the blood and relays this information to the brain. This neuron is a ________ of the ________ pathway.
A. sensory receptor; efferent B. effector; efferent C. sensory receptor; afferent D. effector; afferent
Most respiratory infections are caused by bacteria.?
Indicate whether the statement is true or false
Which of the following properties does not pertain to the arterioles?
a. their radii cannot be changed. b. their walls contain a thick layer of smooth muscle. c. they are responsible for the distribution of blood flow to the various organs. d. they are the major vessels that contribute to total peripheral resistance. e. they are richly innervated by sympathetic nerve fibers.