Which molecule prevents a muscle contraction from occurring when the muscle is at rest?
a. Calcium
b. Troponin-tropomyosin
c. Actin
d. Myosin
ANS: B
Contraction begins as the calcium ions combine with troponin, a reaction that overcomes the in-hibitory function of the troponin-tropomyosin system. Calcium, actin, and myosin all facilitate muscle contraction.
You might also like to view...
Nursing interventions that are appropriate for the client who has lost his or her vision include:(Select all that apply) Standard Text: Select all that apply
1. Use of a radio or audiotapes 2. Ordering a bland diet 3. Offering a massage 4. Placing silk flowers in the client's room 5. Using therapeutic pet therapy
Which job behaviors would the nurse executive consider troublesome no matter which unit employed the nurse? Note: Credit will be given only if all correct choices and no incorrect choices are selected. Standard Text: Select all that apply
1. The nurse made two medication errors today that resulted in poor client outcomes. 2. A nurse was tardy twice last month due to car trouble. 3. A manager reports that a nurse used a piece of equipment that had been taken out of service for malfunction. 4. A nurse did not report to work for 2 days and did not call in the absence. 5. A physician calls to complain that a nurse was rude.
A pregnant patient asks the nurse what "teratogenic effect of medications" means. The nurse states that it is:
1. the ability to cause damage to the pregnant woman. 2. a type of anaphylactic reaction in the pregnant woman. 3. the ability to cause damage to the fetus. 4. a term for stating the therapeutic effect of the medication for the fetus.
Battered woman syndrome is an aspect of which medical diagnosis?
a. Sexual abuse b. Major depression c. Impaired adjustment d. Post-traumatic stress disorder (PTSD)