LS 7C MIDTERM 2 EXAM
,1. Muscle fibers generate maximum force: when the overlap
between actin and myosin is minimal. when contracting at
short lengths.
at intermediate lengths.
when the myosin filaments contact the Z discs.
when pulled to long lengths before contraction.: at
intermediate lengths.
2. A single motor neuron and the population of muscle fibers
that it innervates is called a(n):
excitation-contraction coupling. motor unit.
neuromuscular junction. twitch fiber.
motor endplate.: motor unit.
3. When skeletal muscles contract such that bone segments
move closer together, this action is known as:
flexion. tetanus. extension.
,lengthening contraction: flexion.
4. During bone segments rotate closer, whereas during
bone segments move further apart.
contraction; flexion contraction; extension flexion; extension
rotation; flexion
extension; flexion: flexion; extension
5. Tetanus is a(n):
abnormal muscle contraction.
contraction caused by a single action potential. contraction
where the muscle does not change length.
muscle contraction of sustained force resulting from
repeated action poten- tials.
contraction that slowly increases in force.:
, 6. Muscle contractions have force at slower shortening
contraction velocities compared to higher shortening
contraction velocities.
less stable equal decreased
increased: increased
7. Muscles produce higher forces when lengthening than
when shortening.
False
True: true
8. In mammals, bulk flow only refers to the movement of
oxygen (either into or out of the lungs and within the
bloodstream). Bulk flow never refers to the movement of
carbon dioxide. T/F: false
9. Which of the following statements is FALSE?
,1. Muscle fibers generate maximum force: when the overlap
between actin and myosin is minimal. when contracting at
short lengths.
at intermediate lengths.
when the myosin filaments contact the Z discs.
when pulled to long lengths before contraction.: at
intermediate lengths.
2. A single motor neuron and the population of muscle fibers
that it innervates is called a(n):
excitation-contraction coupling. motor unit.
neuromuscular junction. twitch fiber.
motor endplate.: motor unit.
3. When skeletal muscles contract such that bone segments
move closer together, this action is known as:
flexion. tetanus. extension.
,lengthening contraction: flexion.
4. During bone segments rotate closer, whereas during
bone segments move further apart.
contraction; flexion contraction; extension flexion; extension
rotation; flexion
extension; flexion: flexion; extension
5. Tetanus is a(n):
abnormal muscle contraction.
contraction caused by a single action potential. contraction
where the muscle does not change length.
muscle contraction of sustained force resulting from
repeated action poten- tials.
contraction that slowly increases in force.:
, 6. Muscle contractions have force at slower shortening
contraction velocities compared to higher shortening
contraction velocities.
less stable equal decreased
increased: increased
7. Muscles produce higher forces when lengthening than
when shortening.
False
True: true
8. In mammals, bulk flow only refers to the movement of
oxygen (either into or out of the lungs and within the
bloodstream). Bulk flow never refers to the movement of
carbon dioxide. T/F: false
9. Which of the following statements is FALSE?
