Select all that occur during the plateau phase of an action potential on a cardiac muscle cell.A) Calcium is entering the cell.B) Potassium is exiting the cell.C) Sodium is entering the cell.D) Calcium is exiting the cell.
What will be an ideal response?
A, B
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Activated platelets release several important chemicals from their storage granules, such as adenosine triphosphate (ATP)
a. True b. False Indicate whether the statement is true or false
When a person sits on a hard surface for a period of time, his foot or leg may "go to sleep." This sensation is the result of compressing the _____ nerve
A. femoral B. sciatic C. obturator D. pudendal E. ulnar
When a pacemaker potential in the SA node reaches threshold,
A. the permeability to K+ ions increases. B. many voltage-gated Ca2+ channels open. C. voltage-gated Ca2+ channels close. D. RMP has been restored. E. permeability of the cell does not change.
The term lordosis refers to
A. the anterior convexity in the lumbar region that a child develops when he or she walks upright B. an exaggeration of the secondary curvature that develops in the lumbar region C. a and b D. Neither a nor b