Much of the digestive system relies on the activity of enzymes. The stomach secretions include an enzyme (pepsin) along with HCl to reduce the pH in the stomach to a pH of 2. When the food moves into the small intestine, there are multiple secretions to
raise the pH to 7. How would this pH change affect the activity of the stomach enzyme, pepsin?
A) It would increase the activity of pepsin
B) It would denature pepsin.
C) There would be no change in the activity of pepsin.
D) The active site would be increased.
Answer: B
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Which of the following statements is FALSE?
A. Ca2+ that activates contraction of smooth muscles can come from either the ECF or from the sarcoplasmic reticulum. B. In the absence of any neural input, skeletal muscle cannot generate tension. C. A single smooth muscle cell may be innervated by both a sympathetic neuron and a parasympathetic neuron. D. Synaptic input onto skeletal muscle cells is always excitatory, whereas inputs to smooth muscle cells may be either excitatory or inhibitory. E. Contractile activity of smooth muscle cells does not normally require Ca2+.
Most head injuries are the result of:
A) assault or abuse. B) motor vehicle crashes. C) sports-related incidents. D) falls from a significant height.
Which of the following statements regarding male reproductive function is FALSE?
A. Sperm formed in the testes enter the epididymis before entering the vas deferens. B. The seminal fluid is alkaline and rich in nutrients. C. The Sertoli cells produce androgen-binding protein. D. Sperm entering the epididymis are fully motile. E. Most of the seminal volume is provided by the secretions of the seminal vesicles and prostate gland.
Large proteins and red blood cells normally pass freely through the filtration membrane.
Answer the following statement true (T) or false (F)