Which type of muscle tissue is autorhythmic?
A. skeletal muscle
B. smooth muscle
C. cardiac muscle
D. both skeletal and cardiac muscle
E. both cardiac and smooth muscle
E
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Put these events in the correct chronological sequence:
1. End-plate potentials trigger action potentials. 2. Transverse tubules convey potentials into the interior of the cell. 3. Acetylcholine binds to receptors on the motor end plate. 4. Ca2+ is released from the sarcoplasmic reticulum. A) 3, 1, 4, 2 B) 1, 2, 3, 4 C) 2, 1, 4, 3 D) 4, 3, 2, 1 E) 3, 1, 2, 4
A biomarker test for cancer should ideally be
A) easy to perform. B) specific. C) inexpensive. D) all of the above.
Structure I is the
A) choroid.
B) sclera.
C) ciliary layer.
D) retina.
E) fovea.
The sodium-potassium pump moves ____ sodium ions out of the cell for every 2 potassium ions it moves into the cell
a. 3 b. 5 c. 7 d. 11 e. 13