The anesthetic a dentist injects before drilling to clean and repair a cavity is done to block sensory impulses from a branch of what cranial nerve?
A) abducens
B) facial
C) trigeminal
D) trochlear
Ans: C) trigeminal
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When an impulse arrives at the knob of the motor neuron, calcium
A. enters through active transport pumps and triggers the release of transmitter. B. enters through voltage-gated channels and triggers the release of transmitter. C. exits through active transport pumps and brings transmitter with it. D. exits through voltage-gated channels and triggers transmitter release. E. is released from synaptic vesicles.
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.
A physician is reviewing the chart of a patient with multiple medical issues. She is convinced it is due to the hypersecretion of a particular endocrine gland. Which of the following will she need to know to verify the diagnosis?
A. Target tissues and mechanism of action on the target tissues B. Normal blood levels of the hormone C. Gland secreting the particular hormone D. All of the choices are correct.
Which is correct about the contraction sequence of the heart?
A. The contraction and relaxation of all four chambers happen at the same time. B. The right atrium and ventricle contract at the same time, and as they are relaxing, the left atrium and left ventricle begin to contract. C. Contraction begins in the order: right atrium, then right ventricle, then left atrium, then left ventricle. D. The two atria contract at the same time, and as they are relaxing, the two ventricles contract together. E. The atria and ventricles begin their contractions at the exact same time, but the atrial contraction only lasts half as long as the ventricle contraction.