Explain how scratching a chaffing label on a shirt is an example of a negative feedback loop
What will be an ideal response?
An irritation to the skin from a chaffing shirt label is a stimulus detected by a receptor (or sensor). The receptor sends this information to a control center, the brain, where it is determined that the skin irritation is out of normal range. The control center sends signals to effectors that cause physiological responses to return the variable to normal homeostatic range. Scratching, the response, stops the chaffing by moving the label off the skin, and thus removes the stimulus.
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How would the loss of acetylcholinesterase from the motor end plate affect skeletal muscle?
A) It would make the muscles less excitable. B) It would produce muscle weakness. C) It would cause muscles to stay contracted. D) It would cause muscles to stay relaxed. E) It would have little effect on skeletal muscles.
After crossing the axilla, the axillary artery becomes the
A) radial artery. B) ulnar artery. C) brachial artery. D) subclavian artery. E) digital artery.
Ginger had her blood analyzed and was informed that both anti-B and anti-D antibodies were present. Which of the following accurately explain her test results?
A. Ginger is most likely O? and though she has been exposed to the B and D antigen, she has not been exposed to the A antigen. B. Ginger has type A? blood, but has never been exposed to either the B nor D antigens. C. Ginger has type A? blood and has been exposed to the D antigen at some time in her life. D. Ginger is type B+ and has not been exposed to the B nor the D antigens.
What type of muscle tissue causes vasoconstriction?
A. skeletal muscle B. smooth muscle C. cardiac muscle