Neutrophils are derived from a population of intermediate cells called ________.
A. proerythroblasts
B. monoblasts
C. megakaryoblasts
D. lymphoblasts
E. myeloblasts
Answer: E
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The most significant difference between a paracrine and an autocrine is
A) the method of transport. B) the cell that releases it. C) the route of transport. D) the cell that responds to it. E) There are no differences?they are the same.
The onset of puberty is signaled by
A. emotional upheaval. B. a growth spurt. C. a halt to growth. D. the ability to obtain a drivers license. E. attainment of full adult stature.
Can a skeletal muscle contract without shortening? Why or why not?
A) No, because muscles contract only when the muscle tension exceeds the load. B) No, because muscles contract only when the muscle tension is less than the load. C) Yes, because muscles can still contract during an isometric contraction when the muscle tension is equal to the load. D) Yes, because muscles can still contract during an isotonic contraction when the tension is at a constant level. E) No, because muscles can only generate tension while shortening, never during lengthening.
The infundibulum is a ________
A) projection of the hypothalamus from which the pituitary gland hangs B) bulky nucleus composed of the paraventricular nucleus and the supraoptic nucleus C) portal system between the hypothalamus and the pituitary gland D) mass of endocrine and neural cells E) depression of the sphenoid bone that protects the pituitary gland