The following steps occur in rods when they are excited by a photon of light. Place them in the correct sequence.
1. Membrane sodium channels close.
2. cGMP is broken down.
3. The membrane hyperpolarizes and the rate of neurotransmitter release declines.
4. Transducin is activated.
5. Opsin is activated.
A) 1, 3, 4, 5, 2
B) 3, 5, 2, 1, 4
C) 5, 4, 2, 1, 3
D) 1, 5, 2, 4, 3
E) 4, 5, 2, 1, 3
C) 5, 4, 2, 1, 3
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Identify the true statement(s):
a. NE causes most blood vessels to constrict. b. ACh causes the pancreas to release glucagon c. Binding of a neurotransmitter to a beta-1 receptor on the heart would result in a faster heart rate. d. Both a and b are true e. Both a and c are true
The second largest portion (44%) of blood that settles at the bottom of centrifuged blood is called _____.
Fill in the blank(s) with the appropriate word(s).
The permanent replacement of normal tissue by scar tissue is called:
A) necrosis. B) fibrosis. C) inflammation. D) apoptosis.
A particularly rich plexus of veins is present in the connective tissue of which respiratory struc-ture?
a. Bronchiole b. Larynx c. Nasal concha d. Olfactory epithelium of the anterior nasal cavity e. Primary bronchus