Epinephrine activates the cyclic AMP pathway in liver cells. In this example, epinephrine is a(n) ________ and cAMP is a(n) ________.
A. enzyme; second messenger
B. first messenger; second messenger
C. ligand; receptor
D. second messenger; ion channel
E. first messenger; hydrophobic hormone
Answer: B
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Successive vertebrae articulate at facets on the inferior articular processes of the superior vertebra and facets on the ________ of the adjacent inferior vertebrae
A) dens B) pedicles C) lamellae D) transverse processes E) superior articular processes
Lymph travels to the subcapsular sinus from which structure in the figure?
a) A b) B c) C d) D e) E
Select the statement below that is not true with regards to the process of light adaptation
A) Visual acuity is diminished. B) Retinal sensitivity decreases. C) Rhodopsin is uncoupled from light transduction. D) The activity of rods is reduced by rapid bleaching of rhodopsin.
The left atrioventricular valve is also called the ____________________.
tricuspid bicuspid mitral B and C only are true none of the choices are correct