Why does damaged cartilage heal slowly?
A) Chondrocytes cannot be replaced if killed, and other cell types must take their place.
B) Cartilage is avascular, so nutrients and other molecules must diffuse to the site of injury.
C) Damaged cartilage becomes calcified, thus blocking the movement of materials required for healing.
D) Chondrocytes divide more slowly than other cell types, delaying the healing process.
E) Damaged collagen cannot be quickly replaced, thus slowing the healing process.
B) Cartilage is avascular, so nutrients and other molecules must diffuse to the site of injury.
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Which accurately describes the median eminence of the hypothalamus?
A. It is a site where neurohormones are released into blood vessels. B. It is the site of synthesis of adrenocorticotropic hormone (ACTH). C. It is the stalk connecting the hypothalamus to the posterior pituitary. D. It is the main site where thyroid-stimulating hormone first enters the bloodstream. E. It is the site where vasopressin is released into blood vessels.
An atom has 6 protons, 8 neutrons, and 6 electrons. Its atomic mass number is ________
A) 2 B) 6 C) 8 D) 14 E) 20
A traveling blood clot is called _____.?
A) ?hemorrhage B) ?embolism C) ?phlebitis D) ?claudication
The plasma membrane of a cell is composed of:
a. phospholipid molecules b. cholesterol molecules c. protein molecules d. all of the above