Which of the following is part of the body's third line of defense?
A. Complement
B. B-cells
C. Inflammation
D. Interferons
B. B-cells
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You can be outside on an day where the air temperature is 85oF for hours without getting cold. However, you will get cold in 85oF water before too long unless you are very active. This difference is due to
A. higher heat convection in water relative to air. B. higher heat conduction in water relative to air. C. higher heat evaporation in water relative to air. D. higher heat radiation in water relative to air. E. higher heat transpiration in water relative to air.
________ are the proteins that appear as dark bands that mark the ends of the sarcomeres
Fill in the blank(s) with correct word
Arrange the events of muscular contraction in chronological order
1) muscle shortens 2) calcium binds to troponin 3) filaments slide 4) T tubules are depolarized 5) acetylcholine is released 6) ATP molecule is split a. 4 ? 5 ? 2 ? 1 ? 3 ? 6 b. 4 ? 2 ? 5 ? 6 ? 1 ? 3 c. 5 ? 2 ? 4 ? 1 ? 6 ? 3 d. 6 ? 1 ? 5 ? 4 ? 3 ? 2 e. 5 ? 4 ? 2 ? 6 ? 3 ? 1
The hormone FSH stimulates the development of a follicle in the human female. As the follicle develops, it secretes estrogen. A high level of estrogen decreases the secretion of FSH. This mechanism is an example of
A. cell differentiation B. in vitro fertilization C. positive tropism D. negative feedback