Microscopic Muscle Anat & Phys Quiz

1. Name two functions of the muscular system.

2. Which of the following are characteristics shared by all muscle tissue? (choose all that apply)

• ability to contract
• ability to transport oxygen
• ability to lengthen or stretch
• ability to respond to a stimulus
• ability to filter substances

3. Which type of muscle tissue is shown in the image?

• smooth
• skeletal
• cardiac

6. Which membrane surrounds each fascicle?

• endomysium
• perimysium
• epimysium

7. The neurotransmitter that travels through the synaptic cleft of the neuromuscular junction is

• Calcium
• Na+
• K+
• Acetylcholine

8. The protein channels in the axon terminal that allow calcium through in response to an impulse are ____________-gated channels, while the acetylcholine channels on the sarcolemma of the muscle fiber are ____________-gated.

• chemical, voltage
• voltage, neurotransmitter
• neurotransmitter, voltage
• voltage, chemical

9. Which two molecules move in and out of the muscle fiber, continuing the impulse?

• Calcium and Acetylcholine
• Na+ and K+
• Na+ and Calcium
• K+ and Acetylcholine

10. What is the purple filament in the image below?

• actin
• myosin
• acetylcholine
• sarcolemma

10. What is the black line in the image below?

• Z-line
• M-line
• cross-bridges

11. Calcium binds to _____________, causing __________ to move away from the active site.

• tropomyosin, myosin
• tropomyosin, troponin
• troponin, tropomyosin
• troponin, myosin