A nurse tells you that your blood pressure is 112/70. The "70" refers to __________.
a. your heart rate
b. the velocity of blood during diastole
c. the diastolic pressure from the recoil of the arteries
d. the systolic pressure from ventricular contraction
e. the venous pressure caused by the compression of the blood pressure cuff
Answer: c. the diastolic pressure from the recoil of the arteries
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Select the closest relative to a squirrel.
A. Plants B. Fungi C. Kelp D. Diatoms E. Green algae F. Bacteria
When experimentally applying alpha-bungarotoxin to a muscle, you find that it does not contract when the motor neuron leading to it is electrically stimulated. Knowing that this toxin blocks acetylcholine receptors, what can you conclude about the failure to contract?
A. A contraction fails to occur because an action potential is not generated in the muscle cell. B. A contraction fails to occur because this toxin prevents cross-bridge formation and thereby directly prevents contraction. C. A contraction fails to occur because this toxin directly prevents calcium ion release from intracellular stores. D. A contraction fails to occur because neurotransmitter release by the motor neuron is blocked at the neuromuscular junction. E. A contraction fails to occur because acetylcholine is not released from the motor neuron.
Some biologists believe that life on Earth is in the midst of a sixth major mass-extinction event caused by
A) human activity. B) a gradual decrease in global temperature. C) loss of genetic diversity due to inbreeding. D) coevolution of predator and prey species. E) sustainable agriculture efforts.
List and describe the functions of blood in the human body.
What will be an ideal response?