During the repolarization phase of an action potential, which of the following is the primary activity?
A) Sodium ions are flowing out of the cell.
B) Sodium ions are flowing into the cell.
C) Potassium ions are flowing into the cell.
D) Potassium ions are flowing out of the cell.
Answer: D) Potassium ions are flowing out of the cell
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A mismatch of blood types during a transfusion is dangerous because ________
A) white blood cells from the donor's blood cause inflammation B) antibodies in the donor's plasma will attack and kill the recipient's healthy blood cells C) clotting factors in the donor's blood will cause unwanted clots known as thrombus D) preformed antibodies in the recipient's blood will bind and clump (agglutinate) the donated cells
How does the respiratory system contribute to osteoporosis?
A. Calcium ions released from the bones are excreted. B. Decreased estrogen levels following menopause contribute to the disease. C. Lack of exposure to sunlight reduces vitamin D production and decreases calcium absorption. D. Immune cells resist infections and release chemicals that promote tissue repair. E. Excessive smoking lowers estrogen levels, which increases bone loss.
A muscle end attached to a less movable or relatively fixed part is called the
A. insertion. B. origin. C. symphysis. D. articulation.
In order for both eyes to direct their gaze to the right, which of the following muscles are used?(1) Right lateral rectus(2) Right medial rectus(3) Left lateral rectus(4) Left medial rectus
A. 1, 2, 3 B. 2 and 3 C. 2 and 4 D. 1 and 4 E. 1 and 3