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When a muscle cell responds to a stimulus calcium is released from the?
When a muscle cell responds to a stimulus, calcium is released from the sarcoplasmic reticulum. This calcium binds to troponin, triggering a conformational change that allows myosin to bind to actin and initiate muscle contraction.
What sends an impulse so that muscles can carry out the responce to stimulus?
Nerve impulses, or action potentials, are sent through motor neurons from the central nervous system to the muscles in response to a stimulus. These impulses trigger the release of neurotransmitters at the neuromuscular junction, which bind to receptors on muscle fibers. This binding initiates a series of biochemical events that lead to muscle contraction, enabling the muscles to respond to the stimulus.
What property of smooth and cardiac muscles allows them to initiate their own contractions?
The property of automaticity allows smooth and cardiac muscles to spontaneously initiate their own contractions without needing an external stimulus. This is due to the presence of pacemaker cells in these muscle tissues that can generate action potentials independently.
Where is sinatorial node located?
The sinoatrial (SA) node is located in the right atrium of the heart, near the entrance of the superior vena cava. It serves as the heart's natural pacemaker, generating electrical impulses that initiate the heartbeat and regulate the heart's rhythm. The SA node is crucial for coordinating the contraction of the heart muscles.
How do the upper muscles work?
Upper muscles, primarily located in the shoulders, back, and chest, facilitate a range of movements including lifting, pushing, and pulling. They work in coordination with the nervous system, which sends signals to initiate contraction. This coordination allows for stabilization and mobility of the upper body, enabling activities like reaching, throwing, and lifting. Strengthening these muscles can improve posture and functional movement.
When a muscle fiber is subjected to a stimulus it contracts completely is called?
When a muscle fiber is subjected to a stimulus and contracts completely, this phenomenon is known as the "all-or-nothing response." In this response, if the stimulus reaches a certain threshold, the muscle fiber will contract fully; if it does not reach this threshold, there will be no contraction. This principle applies to individual muscle fibers, while whole muscles can exhibit varying degrees of contraction based on the number of fibers activated.
What requires acetylcholine for contraction?
Anerobic contraction of muscles.
Which muscle trait is the ability to respond to a stimulus such as a nerve or hormone?
Muscle excitability is the ability to respond to a stimulus, such as a nerve signal or hormone, by generating an electrical impulse that leads to muscle contraction. This trait allows muscles to react to signals from the nervous or endocrine systems to produce movement.
What is Thompson's disease?
A hereditary disease of the muscles characterized by prolonged contraction of the muscles whenever voluntary motion is attempted, contraction and relaxation being slow and the muscles stiff.
What the opposite of Contraction?
The general opposite of contraction is expansion, or possibly inflation. For muscles, the opposite of contraction is relaxation.
What organ system works with the muscular system to control muscular contractions?
The nervous system is what will initiate contractions as well as determine the strength of a contraction.
What is a contraction phase of the relaxation phase?
The contraction phase refers to the period in muscle physiology where muscle fibers actively shorten, generating tension and force, typically in response to a stimulus. In contrast, the relaxation phase follows this contraction, during which the muscle fibers return to their resting state and lengthen, allowing for recovery and preparation for the next contraction. Understanding these phases is crucial for grasping how muscles function during physical activity.
