FUNDAMENTALS OF HUMAN PHYSIOLOGY EXAM 3 UIOWA QUESTIONS AND ANSWERS  

FUNDAMENTALS OF HUMAN
PHYSIOLOGY EXAM 3 UIOWA
QUESTIONS AND ANSWERS

, skeletal muscle - ANSWERSA muscle that is attached to the bones of the skeleton and
provides the force that moves the bones
- Striated
- Voluntary

cardiac muscle - ANSWERSMuscle of the heart
- Striated
- Involuntary

smooth muscle - ANSWERSinvoluntary muscle found in internal organs
- Unstriated
- Involuntary

Sarcomere - ANSWERScontractile unit of a muscle fiber

Myosin - ANSWERSthick filament

Actin - ANSWERSthin filament

motor neurons - ANSWERSneurons that carry outgoing information from the brain and
spinal cord to the muscles and glands

Motor unit - ANSWERSA motor neuron and all of the muscle fibers it innervates

neuromuscular junction - ANSWERSpoint of contact between a motor neuron and a
skeletal muscle cell

in-series sarcomeres - ANSWERSsarcomeres that run on top of each other (longer
fiber)

in-parallel sarcomeres - ANSWERSsarcomeres that run parallel to one another (thicker
fiber)
- greater maximum contraction

Cross-bridge cycle - ANSWERSrepeated sequential interactions between myosin and
actin filaments at cross-bridges that cause a muscle fiber to contract

Ca+ - ANSWERSWhat molecule controls the cross bridge cycle?

T-tubules (transverse tubules) - ANSWERSAction potential travels down
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