5 Written questions
4 Matching questions
- The action potential on the muscle cell leads to contraction due to the release of calcium ions. Where are calcium ions stored in the muscle cell?
C) T tubule
D) terminal cisternae of the sarcoplasmic reticulum
- When calcium binds to ____, _____ releases tropomysoin, exposing the myosin binding sites
- Cardiac muscle has a limited regenerative capacity.
- Which of the following would be recruited later in muscle stimulation when contractile strength increases?
A) many small motor units with the ability to stimulate other motor units
B) large motor units with small, highly excitable neurons
C) motor units with larger, less excitable neurons
D) motor units with the longest muscle fibers
- a C
- b troponin
- c True
- d D
5 Multiple choice questions
- a state of sustained partial contraction
- C) myosin
5 True/False questions
Which muscle characteristic describes the ability of muscle to respond to a stimulus?
D) excitability → D) excitability
What is a cross bridge cycle?
A) It is the cycle in which motor units are recruited from small to large, in order to produce gradual increases in force.
B) It is the cycle in which an energized myosin head binds to actin and performs a power stroke, then binds to ATP in order to detach and re-energize.
C) It is the cycle by which the sarcolemma is repeatedly depolarized and repolarized.
D) It is a cycle of repeated stimuli resulting in summation of muscle twitches. → D) skeletal muscle: voluntary control
Contraction of skeletal muscle is controlled by ___ ___ → somatic motor neurons
Which of the following factors influence the velocity and duration of muscle contraction?
A) muscle fiber size
B) frequency of stimulation
C) load placed on the muscle
D) length of muscle fibers activated → B
In an isotonic contraction, the muscle ________.
A) rapidly resynthesizes creatine phosphate and ATP
B) changes in length and moves the "load"
C) never converts pyruvate to lactate
D) does not change in length but increases tension → C