Which of the following types of muscle is voluntary?
a. Cardiac
b. Skeletal
c. Smooth
d. Rough
b. Skeletal
Skeletal muscle is considered voluntary, because it can be controlled intentionally.
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Why is repairing a single-stranded break easier to repair than a double-stranded break?
What will be an ideal response?
The potassium channel differs from the sodium channel in that only the sodium channel
a. uses energy to force ions from the cell. b. uses energy to force ions into the cell. c. does not use energy, whereas the potassium channel does. d. is typically open, and does not block ion movement. e. is typically closed, blocking ion movement.
The release of phosphate-containing detergents into a river would
A) kill algae. B) increase algal growth. C) kill bacteria. D) improve the water quality. E) None of the answers is correct.
What term describes the ectoderm, mesoderm, and endoderm?
A) Inner cell mass B) Extraembryonic membranes C) Primary germ layers D) Blastomeres