If a substance has a plasma concentration of 150 mg/ml and a urine concentration of 1.7 mg/ml, and the urine flow rate is 1.3 ml/min, what is the clearance of this substance?
a. 15 ml/min.
b. 196 ml/min.
c. 0.4 ml/min.
d. can not be determined with these data.
e. none of these answers.
E
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The long absolute refractory period of cardiomyocytes ________.
A. causes the pacemaker potential B. makes the heart prone to arrhythmias C. ensures a short twitch D. prevents tetanus E. prevents the occurrence of ectopic focuses
Embryonic stem cells growing in a lab dish are bathed in a "cocktail" of chemicals that cause them to specialize into branching networks of single-nucleated cells that pulsate in unison. This tissue is most likely
A. epithelial tissue. B. cardiac muscle. C. skeletal muscle. D. smooth muscle.
Which of the following is not true of gray matter?
A. It is found in both the brain and spinal cord. B. It consists of somas, dendrites, and myelinated axons. C. It forms a somewhat butterfly-shaped central core in the spinal cord. D. It is the site of synaptic contact between neurons in the CNS. E. It is not found in the PNS.
Which of the following is not associated with the pons?
A. Sensory information from the superior region of the face B. Sensory information from the inferior region of the face C. Lateral eye movements D. Sensory information from the middle region of the face E. Neck movement