What molecules form the thick filaments within muscle?
a. microfilaments
b. myosin
c. actin
d. myoblasts
e. troponin
b
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Which of the following is NOT a common characteristic of epithelial tissues?
a) Cells are tightly packed together. b) Large amount of extracellular matrix. c) Contains no blood vessels within tissue. d) Found on the exposed surfaces of the body. e) Line the inside of blood vessels.
A sarcomere is best described as
A) a unit within a muscle fiber. B) a group of fascicles. C) a group of muscle fibers. D) a part of the sarcoplasmic reticulum.
Thickness of the barriers separating the air or water from the blood increases because of
a. low or high environmental pH. b. pulmonary edema. c. pulmonary fibrosis. d. pneumonia. e. all of these.
________ support, protect, and nourish nerve cells
A) Nurse cells B) Neuroglia C) Neurons D) Nurturons E) Nutrient cells