Which of the following is the first event in defense against bacteria?
A) activation of T cytotoxic cells
B) macrophage activation
C) interferon release
D) antigen appearance on plasmalemma
E) activation of B cells
B) macrophage activation
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What is the correct order of structures through which the sperm penetrates during fertilization?
A. Corona radiata, oocyte plasma membrane, zona pellucida B. Zona pellucida, corona radiata, oocyte plasma membrane C. Corona radiata, zona pellucida, oocyte plasma membrane D. Zona pellucida, oocyte plasma membrane, corona radiata
Asystole is the total absence of ventricular electrical activity. Explain why defibrillation would not be effective in this situation
What will be an ideal response
Careful measurements of GFR are made by injection of _______, but approximations of GFR can be made more simply by measuring renal plasma clearance of _________
A. creatine phosphate; insulin B. insulin; creatine phosphate C. inulin; creatinine D. creatinine; inulin
What happens when acetylcholine stimulates its receptors in the neuromuscular junction?
A. The permeability of the sarcolemma to Na+ increases. B. The release of Ca2+ from the sarcoplasmic reticulum decreases. C. The threshold of the muscle fiber lowers. D. The positive charge on the sarcolemma decreases. E. The inhibitory effect of acetylcholinesterase is overridden.