Why do people sometimes have a difficult time holding their urine?
What will be an ideal response?
Answer: Contraction of the detrusor muscle of the bladder and relaxation of the internal urethral sphincter is under involuntary control, and can occur if the bladder is over-full. The external urethral sphincter is under voluntary control, but this can sometimes be challenging.
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What is the most abundant and most important inorganic compound in the body?
a) water b) oxygen gas c) carbon dioxide d) glucose e) DNA
Which of the following statements concerning HCl in the stomach is correct?
a. It inactivates salivary amylase and the pancreatic enzymes. b. It activates pepsinogen. c. It establishes a low pH in the stomach. d. It is secreted by oxyntic cells. e. All of the above.
Where does the acetylcholine released for muscle contraction bind?
A) receptors in the axon terminal B) receptors in the motor end plate C) receptors in the sarcoplasmic reticulum D) receptors in troponin
Inheritance of the ABO blood group is an example of
A. incomplete dominance only. B. codominance and multiple alleles. C. incomplete dominance and sex-linked inheritance. D. complete dominance only. E. sex-linked inheritance only.