What type of muscle contraction is occurring is a person is sitting up straight?
a. Isotonic contraction.
b. Tetanic contraction.
c. Tonic contraction.
d. Isometric contraction.
Answer: c. Tonic contraction.
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The order in which HIV breaches barriers and affects immunity is
A. ingestion, entering the circulation, entering helper T cells. B. crossing the mucosal barrier, entering macrophages, then B cells, then natural killer cells. C. crossing the mucosal barrier, entering macrophages, entering helper T cells, then cytotoxic T cells. D. inhalation, entering the circulation, entering helper T cells.
The type of bone that is adapted to withstand stresses that arrive from many directions is ________ bone
A) spongy B) trabeculae C) compact D) lamellar E) irregular
Reactions within ________ provide most of the energy needed by a typical cell
A) cytoplasm B) the plasma membrane C) the mitochondria D) the endoplasmic reticulum E) nucleus
Match the following:
A) Depolarization B) Relative refractory period C) Action potential D) Absolute refractory period E) Repolarization ) The neuron cannot respond to a second stimulus, no matter how strong. 2) The interior of the cell becomes less negative due to an influx of sodium ions. 3) The specific period during which potassium ions diffuse out of the neuron due to a change in membrane permeability. 4) Also called a nerve impulse transmitted by axons. 5) An exceptionally strong stimulus can trigger a response.