5 Written questions
4 Matching questions
- Three discrete types of muscle fibers are identified on the basis of their size, speed, and endurance. Which of the following athletic endeavors best represents the use of red fibers?
- What structure in skeletal muscle cells functions in calcium storage?
- How is acetylcholine (ACh) removed from the synaptic cleft?
A) acetylcholinesterase (AChE; an enzyme)
B) diffusion away from the synaptic cleft
C) a reuptake pump on the axon terminal
- Cross bridge formation between myosin heads and actin molecules is caused by the elevation of calcium ion concentration in the cytosol. During rigor mortis, this elevation of calcium ion concentration in the cytosol is permanent because ________.
A) mitochondria stop producing ATP molecules required by the sarcoplasmic reticulum's calcium ion pumps
B) troponin molecules bind irreversibly to calcium ions to prevent them from being removed from the cytosol
C) tropomyosin molecules bind irreversibly to calcium ions to prevent them from being removed from the cytosol
D) acetylcholine continues to stimulate the release of calcium ions from the sarcoplasmic reticulum
- a a long relaxing swim
- b A
- c sarcoplasmic reticulum
- d B
5 Multiple choice questions
- endomysium, perimysium, and epimysium
- thick myofilaments
5 True/False questions
______ weight lifting → aerobic pathway
the smallest contractile unit of a muscle fiber. → sarcomere
Muscle contraction will always promote movement of body parts regardless of how they are attached. → False
During vigorous exercise, there may be insufficient oxygen available to completely break down pyruvic acid for energy. As a result, the pyruvic acid is converted to ________. → lactic acid
Slow oxidative muscle fibers are best suited for ________.
A) lifting heavy weights at the gym
B) running a 100-yard dash
C) running a marathon
D) hitting a baseball → C