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
________________________
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
________________________
