Which events occur during the recycling of aged or damaged erythrocytes? (Order is not important.)
a: The heme group is converted into biliverdin.
b: Bilirubin is placed in long-term storage in the liver.
c: The iron ions in hemoglobin are removed.
d: The iron ions are stored in the liver.
e: The iron ions are stored in the red bone marrow.
f: Membrane proteins and globin proteins are broken down and reused.
g: The erythrocyte contents, excluding the globins, are excreted unchanged via the digestive tract.
A. a, b, c, e, f
B. a, c, d, f
C. a, b, c, g
D. c, d, g
E. c, e, g
B
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These cells in the CNS have cilia that move in order to circulate cerebrospinal fluid ________
A) ependymal cells B) astrocytes C) oligodendrocytes D) Schwann cells
Genes that appear on the X chromosome are said to be
A) X-linked. B) autosomal recessive. C) heterozygous. D) homologous. E) lethal.
Stretching a myocardial cell
A) decreases the force of a contraction and allows more Ca2+ to enter. B) only increases the force of contraction. C) only decreases the force of a contraction. D) allows more Ca2+ to enter and increases the force of a contraction. E) only allows more Ca2+ to enter.
Cutaneous receptors respond to stimuli that are outside the body, and are therefore also ________.
A. special senses B. proprioceptors C. interoceptors D. exteroceptors