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Each muscle fiber is also called a?
Each muscle fiber is also called a myofiber.
What is the fiber type in the dorsal root?
The fiber type in the dorsal root is mainly composed of sensory nerve fibers that transmit sensory information from the periphery to the central nervous system. It is made up of both Aδ fibers responsible for transmitting sharp, well-localized pain and touch sensations, and C fibers responsible for transmitting dull, diffuse pain and temperature sensations.
Which nerve fiber do impulses travel slowly?
Unmyelinated nerve fibers conduct impulses more slowly than myelinated nerve fibers. Myelinated nerve fibers have a fatty substance called myelin sheath that allows for faster transmission of impulses compared to unmyelinated fibers without this sheath.
Mechanism of nerve conduction?
Nerve conduction involves the transmission of electrical impulses along the length of a nerve fiber. When a nerve is stimulated, sodium ions rush into the nerve cell, causing a change in electrical charge. This creates an action potential that travels down the nerve fiber, activating adjacent areas and allowing the signal to be transmitted. Once the impulse reaches its destination, neurotransmitters are released to stimulate the next nerve cell or muscle fiber.
What is the connective tissue covering called that encloses the sarcolemma of an individual muscle fiber?
The connective tissue covering that encloses the sarcolemma of an individual muscle fiber is called endomysium. It surrounds each muscle fiber and provides support and protection to the muscle cells.
An axon of an efferent neuron could synapse with?
An axon of an efferent neuron could synapse with a muscle fiber, gland, or another neuron in the peripheral nervous system.
What is sacrolemma?
The sarcolemma is the cell membrane of a muscle fiber. It surrounds and protects the muscle fiber and controls the movement of substances into and out of the cell. The sarcolemma plays a crucial role in muscle contraction and the transmission of nerve impulses to the muscle fiber.
What is the primary role of muscle spindles?
the striated portions of the intrafusal fiber contract to keep the spindle taut at different muscle lengths. If the whole muscle is stretched, the muscle spindle is also stretched, triggering sensory nerve impulses on its nerve fiber. These sensory fibers synapse in the spinal chord with lower motor neurons leading back to the same muscle. Impulses triggered by stretch of the muscle spindle contract the skeletal muscle.
What fiber type in ventral root?
Efferent or Motor
What is the function of End Plates?
A motor endplate is a large special synaptic contact between motor axons and each skeletal muscle fiber. Each muscle fiber forms one endplate. Its function is to transmit impulses from nerves to muscles.
What is the all none law of muscle response?
all-or-none law is the principle that the strength by which a nerve or muscle fiber responds to a stimulus is not dependent on the strength of the stimulus. If the stimulus is any strength above threshold, the nerve or muscle fiber will give a complete response or otherwise no response at all
What is the function of motor end plate?
A motor endplate is a large special synaptic contact between motor axons and each skeletal muscle fiber. Each muscle fiber forms one endplate. Its function is to transmit impulses from nerves to muscles.
Where do nerve impulses first stimulate a skeletal muscle fiber?
The motor nerve cells control the skeletal muscle
How do the nerve impulses get from the sarcolemma plasmalemma into the individual muscle fiber?
Nerve impulses travel down from the neuron and cause ACh to be released at the axon terminal. If enough Ach binds to the receptors on the plasmalemma the action potential is tranmitted through the whole muscle fiber because Na+ enters the cell and depolarize it. The action potential travels along the T-tubules. These transmit it to the Sarcoplasmatic Reticulum which releases Ca2+ into the muscle fiber (as do the T-tubules themselves). The Ca2+ frees the bindingsite for myosin on actin so that contraction can occur.
Does an unmyelinated fiber conduct impulses faster than a myelinated fiber?
False
What are all muscle cells called?
A single muscle cell is called a muscle fiber.
Which fiber tract carries impulses from the cerebrum to lower CNS areas?
The corticospinal tract carries impulses from the cerebrum to lower CNS areas, primarily to control voluntary movements throughout the body. It is involved in motor function and helps in coordinating muscle movements.
