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What is a sacroplasm?
A sacroplasm is the cytoplasm of inside a skeletal muscle cell.
What neuron conducts impulses away from the cns to muscle glands?
Motor neurons
What substance is released into the sacroplasm reticulum causing muscle relaxation?
calcium ion
Where are the cross bridges involved in muscle contraction?
in the terminal cisternae
What is the difference between a dyad and triad in skeletal cardiac muscle?
In skeletal muscle, a triad is formed when a T-Tubule is flanked on either side by the calcium containing Terminal Cisternae of the Sarcoplasmic Reticulum, at the level of the Z-line. The intimate association of these three membranous sturctures (Terminal Cisternae---T-Tubule---Terminal Cisternae) for a Triad. This differs from a diad (or Dyad), in cardiac muscle where the T-Tubule is only intimately associated with ONE Terminal Cisternae.
The triads of a muscle fiber consist of?
Two terminal cisternae and a T-tubule
Where are the calcium ions stored in the muscle cells?
terminal cisternae of the sarcoplasmic reticulum
Which type of muscle is controlled at will by impulses from the brain?
All muscles are controlled by impulses from the brain. Skeletal muscle is, with few exceptions, the only type of muscle that can be controlled at will.
What does the terminal cisternae of the sarcoplasmic reticulum release?
The terminal cisternae release calcium ions into the muscle cell in response to an action potential. This calcium triggers muscle contraction by binding to troponin, which allows myosin to bind with actin and initiate the sliding filament mechanism.
What is muscle conductivity?
Ability to conduct impulses along the muscle membrane.
What is the order of minimum elements in a relax arc?
1. The receptor reacts to a stimulus. 2. The sensory neuron conducts the afferent impulses to the CNS. 3. The integration center consists of one or more synapses in the CNS. 4. The motor neuron conducts the efferent impulses from the integration center to an effector. 5. The effector, muscle fibers or glands, respond to the efferent impulses by contraction or secretion a product, respectively.
Does a nerve provided impulses for many muscle fibers or just few?
A nerve can stimulate impulses to several muscle fibers. When muscle fibers are grouped they form a single muscle group like the biceps.
