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Which type of muscle can contract without being stimulated by the nervous system?
cardiac muscle tissue
Before a muscle cell can be stimulated to contract again what must occur?
Repolarization
When muscle fibers are stimulated to contract what is occur ing?
When muscle fibers are stimulated to contract, an electrical impulse travels along the muscle cell membrane, leading to the release of calcium ions from the sarcoplasmic reticulum. This release of calcium triggers the interaction between actin and myosin filaments, the proteins responsible for muscle contraction. The myosin heads attach to actin and pull, causing the muscle fiber to shorten and generate force. This process is known as the sliding filament theory of muscle contraction.
When a muscle is stimulated do all motor units fire why or why not?
When a muscle is stimulated not all motor units in the nerve are fired. More muscle fibers are stimulated, however and smaller nerves are stimulated before larger ones.
Which cell contracts when stimulated by nerve impulses?
Muscle cells contract when stimulated by nerve impulses. Specifically, in skeletal muscle, motor neurons release neurotransmitters at the neuromuscular junction, triggering an action potential in the muscle cell. This leads to the release of calcium ions, which facilitate the interaction between actin and myosin filaments, resulting in muscle contraction.
What kind of muscle makes your heart?
You call it as cardiac muscles. The muscle fibers contract rhythmically. The muscle fibers are attached to each other end to end. This facilitates the conduction of the impulse. The muscle fiber can be stimulated to give you contraction of the the same.
What is the function of the muscle fibers?
Muscle fibers contract to generate force and produce movement in the body. They are responsible for actions such as lifting objects, running, and even maintaining posture. Additionally, muscle fibers play a vital role in regulating body temperature and supporting various bodily functions.
What law states that muscle fiber cannot partially contract?
The all-or-none law states that muscle fibers cannot partially contract; instead, they either fully contract or remain relaxed. When a muscle fiber is stimulated by a nerve impulse that reaches a certain threshold, it will contract maximally. This law applies to individual muscle fibers, while whole muscles can exhibit varying degrees of contraction through the recruitment of multiple fibers.
The ability of a muscle to contract and relax is dependent on the flow of what?
The ability of a muscle to contract and relax is dependent on the flow of calcium ions. When a muscle is stimulated, calcium is released from storage sites within the muscle cell, allowing the muscle fibers to slide past each other and generate force. Removal of calcium from the muscle cell leads to relaxation of the muscle.
Which type of muscle CANNOT contract without being stimulated by the nervous system?
Cardiac muscle. Unlike skeletal and smooth muscle, the contraction of cardiac muscle is involuntary and requires stimulation from the nervous system. This ensures that the contractions of the heart are synchronized and coordinated.
Which type of muscle ca be stimulated by norepinephrine?
smooth muscle
Does skeletal muscle need stimulation to contract?
Yes! Although we have total control over these muscles, they still need stimulation to contract. The difference with muscles that we don't control is that we decide if we want to make this stimulation.
