Which part of the microscope is responsible for making small changes in focus when using the high-power objective lens?
A. Iris diaphragm lever
B. Coarse adjustment knob
C. Substage illuminator
D. Fine adjustment knob
E. Rotating nosepiece
Answer: D
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If a neurotransmitter hyperpolarizes a cell membrane and an action potential is less likely, the change is called ________ potential.
What will be an ideal response?
Drugs called beta-blockers ________
A) decrease heart rate and blood pressure B) have widespread sympathetic effects C) increase a dangerously low heart rate D) are potent antidepressants
Bruce has colorectal cancer that has spread to his lymphatic system. He is given a drug
that is an angiogenesis inhibitor. The drug works by A) halting cell division only in tumor cells. B) cutting off the supply of ATP to cancer cells. C) starving tumors by cutting off their blood supplies. D) stimulating new blood vessels to serve tissue damaged by the cancer.
Which of the following describes a comminuted fracture?
A. A fine crack is visible but bones are still aligned. B. The fracture spirals around the axis of a long bone. C. The fracture is parallel to the long axis of the bone. D. The bone is broken into three or more pieces. E. The bone is bent on one side and has an incomplete fracture on the other side.