When a muscle contracts at a joint, which of the following affects torque?
A. the rotary component of muscle force
B. the stabilizing component of muscle force
C. the dislocating component of muscle force
D. none of the above
A. the rotary component of muscle force
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When a skeletal muscle fiber is at rest, there is more sodium outside the cell as compared to the sarcoplasm
Indicate whether this statement is true or false.
Chromosomes are pulled by spindle fibers to opposite sides of the cell during:
a. interphase b. prophase c. anaphase d. telophase
Answer the following statements true (T) or false (F)
1. Luteinizing hormone is also called the ovulating hormone. 2. Males also produce luteinizing hormone. 3. ADH causes water to be excreted in the urine. 4. A person who was working hard on a hot day and perspiring freely would probably have a fairly high concentration of ADH in his blood. 5. Oxytocin stimulates contraction of the pregnant uterus.
Why does rigor mortis result in muscular rigidity after death?
A. The enzyme that hydrolyzes ATP is no longer being produced; therefore, the myosin heads will not receive the actin filament. B. The ATP necessary to bind to the myosin head and release the cross bridge is no longer present. C. ATP production is no longer possible; therefore, cross bridges cannot be formed. D. A buildup of intracellular calcium keeps the troponin molecule free of the active site on actin.