Relaxation of the heart chambers is called
A) diastole.
B) systole.
C) depolarization.
D) hyperpolarization.
E) repolarization.
A) diastole.
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The following are steps in the cell-mediated immune response. What is the correct sequence for these steps? 1. Several cycles of mitosis occur. 2. Antigen is engulfed and presented by a macrophage. 3. Cytotoxic T cells migrate to focus of infection. 4. T cells with specific receptors recognize the antigen. 5. T cells differentiate into cytotoxic T cells or T memory cells. 6. Cytotoxic T cells
release perforin and/or lymphotoxin. A) 4, 1, 5, 3, 6, 2 B) 2, 4, 1, 5, 3, 6 C) 1, 2, 4, 5, 3, 6 D) 3, 2, 4, 1, 5, 6 E) 3, 6, 4, 5, 1, 2
Which of these types of channels is involved in leaking sodium and potassium ions across the membrane in order to establish the resting potential of a cell?
a) A b) B c) C d) D
Genes present only on the X chromosome are called ________
A) sex-linked genes B) male genes C) female genes D) These genes do not have a special name.
A 100 dB sound (loud) of 150 Hz (low pitch) would cause which of the following to occur?
A) The basilar membrane to vibrate slightly near its proximal end B) The tectorial membrane to vibrate slightly near its distal end C) The basilar membrane to vibrate slightly near its distal end D) The tectorial membrane to vibrate vigorously near its proximal end E) The basilar membrane to vibrate vigorously near its distal end