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When does wave summation occurs?
Wave summation occurs when a muscle is stimulated rapidly enough that it does not have time to completely relax between stimuli, causing the contractions to combine or "summate" to produce a stronger muscle contraction. This phenomenon can occur during repetitive or sustained muscle activity, leading to increased muscle force production.
The repair of cardiac muscle and nervous tissue occurs only by?
fibrosis
The band that occurs where two cardiac muscle cells join together?
The intercalated disc is the band that forms by the joining of two cardiac muscles. These muscles work together to form a syncytium.
What is ischemic heart tissue?
Ischemia occurs when there is not enough oxygenated blood reaching the cardiac muscle cells.
What causes wave summation?
Wave summation occurs when a muscle undergoes rapid stimulation before it has fully relaxed, causing subsequent twitches to combine and result in a more forceful contraction. This is caused by an accumulation of calcium ions within the muscle fiber, which enhances the cross-bridge cycling process and leads to greater tension development.
Uncontrolled muscle contractions the same as skeletal muscle contractions?
Uhh, no uncontrolled muscle contraction occurs in smooth and cardiac muscles... there are many differences between these two types of muscles; controlled and uncontrolled muscle contraction.....
A muscle is stimulated and exhibits a contraction twitch Before this twitch is over it is stimulated again and a second twitch occurs piggyback on the first one and causes a higher contraction?
summation
What is cardiac depolarization?
Cardiac depolarization refers to the process by which the heart's cardiac muscle cells undergo a change in electrical charge, leading to the initiation of a heartbeat. This occurs when sodium ions rush into the cells, causing the interior to become more positively charged. This electrical event triggers the contraction of heart muscle fibers, allowing the heart to pump blood effectively. Depolarization is a crucial part of the cardiac cycle, ensuring coordinated heart function.
How is wave summation achieved in vivo?
simply: Wave summation occurs when a second stimulus is applied before relaxation occurs completely. In depth: In order for a muscle to contract electrical shock or nerve impulse must cause voltage-sensitive tubule proteins (T-tubules) of sarcoplasmic reticulum to change shape and allow Ca2+ into cytosol. Ca2+ binds to troponin (changing its shape) allowing myosin (makes thick filaments) to attach to actin ( makes thin filaments). Myosin pulls itself along actin via ATP hydrolysis, this is called a cross bridge cycle, basically shortening of muscle. Before the contraction stops, another stimulus is sent to the muscle allowing more Ca2+ into the cytosol which keeps allowing cross bridge cycle. wave summation means the contractions are added together. thus increasing the force of the second stimuli. force will increase until the muscle reaches its threshold.
What is the physiological response of cardiac muscle to stretching?
When cardiac muscle is stretched, it responds through the Frank-Starling mechanism, which enhances its contractile force. This physiological response occurs because stretching increases the overlap of actin and myosin filaments within the muscle fibers, leading to a stronger contraction. Additionally, the increased preload from stretching can elevate stroke volume, improving overall cardiac output. However, excessive stretching can lead to detrimental effects on heart function.
What is meant by summation at a synapse and how can the two ways it is accomplished be described?
Summation is the method in which signal transmission between neurons occurs. Summation occurs through excitatory neurotramitters and inhibitory neurotransmitters. Excitatory produces depolarization of the postsynaptic cell. Inhibitory mitigates the effects of an excutatory neurotransmitter. For more information visit the Related Link.
What is the difference between wave summation and tetanus?
in wave summation muscular fibers recieve second stimulus after a refractory period and before fiber relaxes while in tetanus the fiber receives 20-30 stimuli per second and it relax partialy.
