Which of the following occurs during a concentric isotonic contraction?
Which of the following occurs during isotonic concentric contraction? The length of the muscle decreases with contraction.
Which of the following is an isometric contraction?
Isometric contraction occurs when muscle length remains relatively constant as tension is produced. For example, during a biceps curl, holding the dumbbell in a constant/static position rather than actively raising or lowering it is an example of isometric contraction.
Which of the following occurs during the contraction phase?
This next phase is called the contraction phase. During the contraction phase the cross-bridges between actin and myosin form. Myosin moves actin, releases and reforms cross-bridges many times as the sarcomere shortens and the muscle contracts. ATP is used during this phase and energy is released as heat.
Which of the following occurs during the latent of muscle contraction?
Which of the following occurs during the latent period of muscle contraction? Acetylcholine is released at the axon terminal. An action potential is generated. Acetylcholine is released at the axon terminal and an action potential is generated.
What occurs during an isotonic contraction?
Isotonic contractions maintain constant tension in the muscle as the muscle changes length. This can occur only when a muscle’s maximal force of contraction exceeds the total load on the muscle. Isotonic muscle contractions can be either concentric (muscle shortens) or eccentric (muscle lengthens).
Which is an example of a concentric contraction?
Concentric contraction occurs when the total length of the muscle shortens as tension is produced. For example, the upward phase of a biceps curl is a concentric contraction.
Which occurs during muscle contraction?
Muscle contraction occurs when the thin actin and thick myosin filaments slide past each other. … In this conformation the cross-bridge binds weakly to actin and attaches and detaches so rapidly that it can slip from actin site to actin site, offering very little resistance to stretch.
What occurs during latent period of isometric contractions?
The latent period refers to the period of time, in which no force is generated, that elapses between the generation of an action potential and the beginning of muscle contraction. The contraction phase begins at the end of the latent period and ends at the peak of muscle tension.
What occurs in the muscle fiber during the latent period quizlet?
what is happening during the latent period? The muscle cells are biochemically preparing to contract, includes all biochemical events from acetylcholine binding to sarcolemma through cross-bridge formation. … Sarcomeres are shortening, causing the muscle cells to contract in turn, which causes a force increase.
Which occurs during muscle contraction quizlet?
When muscle contraction occurs. The actin and myosin filaments temporary form cross-bridge attachments and slide over each other, shortening the overall length of the sarcomeres.
What are the 5 steps of muscle contraction?
What are the five steps of muscle contraction?
- exposure of active sites – Ca2+ binds to troponin receptors.
- Formation of cross-bridges – myosin interacts with actin.
- pivoting of myosin heads.
- detachment of cross-bridges.
- reactivation of myosin.
Which of the following do not occur during muscle contraction?
Decrease in length of actin myofilaments.
Which occurs during muscle contraction multiple choice question?
During contraction, the cocked myosin head binds to an exposed active site on the actin protein of the filament to form a cross-bridge. Which occurs during muscle contraction? Multiple choice question. The myofilaments shorten.
What is the difference between concentric and eccentric muscle contraction?
There are 2 types of isotonic contractions: concentric and eccentric. In a concentric contraction, the muscle tension rises to meet the resistance then remains stable as the muscle shortens. During eccentric contraction, the muscle lengthens as the resistance becomes greater than the force the muscle is producing.
What happens during muscle contraction and relaxation?
When the stimulation of the motor neuron providing the impulse to the muscle fibers stops, the chemical reaction that causes the rearrangement of the muscle fibers’ proteins is stopped. This reverses the chemical processes in the muscle fibers and the muscle relaxes.
Which of the following is a role of ionic calcium in muscle contraction?
How do calcium ions initiate contraction in skeletal muscle fibers? Calcium ions provide the energy necessary for the myosin head power stroke. Calcium ions bind to troponin, changing troponin’s shape. Calcium ion movement depolarizes the sarcolemma at the synaptic cleft.
During what type of contraction does a muscle shorten quizlet?
In an eccentric contraction, the muscle will shorten if the load is greater than the peak tension the muscle can develop. In a concentric contraction, the tension in the skeletal muscle increases as the muscle shortens. In an isotonic contraction, the muscle as a whole does not change length.
How do isotonic and isometric contractions differ?
2 What is the difference between isometric and isotonic exercise? Isotonic muscle contraction produces limb movement without a change in muscle tension, whereas isometric muscle contraction produces muscle tension without a change in limb movement.
What are the 6 steps of muscle contraction?
Terms in this set (6)
- Ca2+ release from SR terminal Cisterinae binding site exposure.
- Myosin head binding to actin binding sites.
- Release of ADP & Pi Causes power stoke.
- ATP causes Myosin head to be released.
- ATP is hydrolyzed, re-energizes the Myosin head.
- Ca2+ pumped back into SR terminal cisterine.
What type of receptor is involved in signaling muscle contractions?
Skeletal muscle contraction and changes with exercise. (A) Neurotransmitter (acetylcholine, ACh) released from nerve endings binds to receptors (AChRs) on the muscle surface. The ensuing depolarization causes sodium channels to open, which elicits an action potential that propagates along the cell.