Which type of cell lines the ventricles of the brain and help produce cerebrospinal fluid?
A. Ependymal cells
B. Microglia
C. Satellite cells
D. Oligodendrocytes
Answer: A
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On a normal ECG, a wave for repolarization of the atria is not recorded. Why?
a. the leads are not placed in a position to pick it up. b. no repolarization of the atria occurs normally. c. it occurs simultaneously with ventricular depolarization and is masked by the QRS complex. d. it does not travel through body fluids. e. it is too small to be picked up by external recording electrodes.
Which of the following would occur if you touched a hot object with your right hand?
A. A stretch reflex would be triggered that would cause contraction of extensor muscles in the right arm. B. A withdrawal reflex would be triggered by nociceptors that would stimulate contraction of flexor muscles in the right arm. C. Reflex mechanisms would stimulate contraction of the extensor muscles of the right arm. D. A withdrawal reflex would be triggered by stretch receptors that would inhibit contraction of extensor muscles of the right arm. E. Nociceptors send pain information to the cerebral cortex, and descending activation of alpha motor neurons to extensor muscles would make you withdraw your right hand from the object.
The ureters are lined by what kind of epithelium, which allows them to be stretched when undergoing peristalsis and moving urine?
simple cuboidal stratified squamous simple columnar transitional
Ions are transported across membranes using __________, which requires __________.
A)channel-mediated facilitated diffusion; kinetic energy B)simple diffusion; kinetic energy C)channel-mediated facilitated diffusion; ATP energy D)carrier-mediated facilitated diffusion; ATP energy