The synchronous contraction of a single motor unit is known as a(n)
A) twitch.
B) asynchronous motor unit summation.
C) cross-bridge.
D) fasciculation.
E) muscle action potential.
Answer: D
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Which of the following statements is NOT true regarding sympathetic stimulation of the heart?
a. It increases the rate of depolarization of the SA node. b. It increases excitability of the AV node. c. It results in stronger ventricular contractions. d. It increases venous return. e. None of these.
Explain why hyperventilation can prolong the time you can hold your breath. Can this be dangerous (for example, hyperventilation followed by swimming underwater)?
What will be an ideal response?
Robert Hooke was an English scientist who first described ____ by looking at a thin slice of cork under his primitive microscope
a. organelles b. cells c. plastids d. proteins
Hyaluronic acid is a component of the ________
A) organic matrix B) osteocyte C) inorganic matrix D) mineralized salts