Where does hemopoiesis occur?
A. Yellow bone marrow
B. Endosteum
C. Red bone marrow
D. Epiphyseal line
E. Nutrient foramina
Answer: C
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If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid, ________
A) tetanic contraction would occur due to the short absolute refractory period of cardiac muscle B) threshold is reached more quickly and heart rate would increase C) potassium channels compensate and no change in heart rate would occur D) heart rate would decrease, but blood pressure would rise due to the excess sodium present
________ are stationed throughout the body, always in connective tissue, and operate both in the allergy response and to expel foreign invaders.
A. Antigens B. Antibodies C. Mast cells D. Natural killer cells
The iris consists of layers of____________________ and ____________________ smooth muscle fibers
Fill in the blank(s) with correct word
Answer the following questions true (T) or false (F)
1. Urine dripping from a renal pyramid passes first into the major calyx then into the minor calyx. 2. The glomerulus is fed and drained by arterioles. 3. The proximal tubule is lined with simple cuboidal epithelium and microvilli.