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What structure is the effector for the somatic motor stimulation?
The effector for somatic motor stimulation is the skeletal muscle. Somatic motor neurons innervate these muscles, leading to voluntary movements. The motor unit, consisting of a motor neuron and the muscle fibers it innervates, is responsible for muscle contraction in response to somatic motor stimulation.
The response of a motor unit to a single action potential of its motor neuron is called?
The response of a motor unit to a single action potential of its motor neuron is called a muscle twitch. This involves the contraction of all the muscle fibers within the motor unit in response to the stimulation from the motor neuron.
Where does the nerve impulse travel from the reflex arc?
The nerve impulse typically travels from the sensory neuron to the spinal cord, where it is processed by interneurons, and then to the motor neuron to elicit a response from the effector organ or muscle.
How do motor neurons receive instructions from adjacent neurons?
Motor neurons receive instructions from adjacent neurons through synaptic connections, where neurotransmitters are released from the presynaptic neuron and bind to receptors on the postsynaptic motor neuron. This activates an action potential in the motor neuron, leading to the transmission of signals that ultimately result in muscle contraction.
How does motor impulse move throughout the body?
Motor impulses travel from the brain through the spinal cord via motor neurons. When the brain sends a signal, it activates these neurons, which then transmit the impulse to muscle fibers at the neuromuscular junction. This process induces muscle contraction, allowing movement. The entire pathway relies on electrical signals and neurotransmitter release to facilitate communication between the nervous system and muscles.
What structure is the effector for the somatic motor stimulation?
The effector for somatic motor stimulation is the skeletal muscle. Somatic motor neurons innervate these muscles, leading to voluntary movements. The motor unit, consisting of a motor neuron and the muscle fibers it innervates, is responsible for muscle contraction in response to somatic motor stimulation.
What is the name of the point at which motor neuron synapses motor end plate?
The point at which a motor neuron synapses with a muscle fiber's motor end plate is called the neuromuscular junction. This is where the nerve impulse is transmitted from the motor neuron to the muscle fiber, leading to muscle contraction.
What does contractile impulse mean?
Contractile impulse refers to the electrical signal that initiates contraction in muscle cells. In cardiac muscle, this impulse originates from the sinoatrial (SA) node, propagating through the heart to coordinate rhythmic contractions. In skeletal muscle, it results from signals transmitted by motor neurons. Overall, contractile impulses are crucial for the effective functioning of both cardiac and skeletal muscles.
Weak stimulation of a motor neuron causes the muscle to what?
contract weakly
What stops muscle stimulation when the motor neuron ceases firing?
Acetylcholinesterase is the enzyme that stops muscle stimulation when the motor neuron ceases firing. This enzyme enables acetyl and choline to release their binding sites.
Where do nerve impulses first stimulate a skeletal muscle fiber?
The motor nerve cells control the skeletal muscle
What is the direction of impulse for motor neurons?
Motor neurons carry impulses from the central nervous system to muscles or glands, resulting in a response such as muscle contraction or secretion of a substance. The direction of impulse for motor neurons is typically from the central nervous system (brain or spinal cord) to the target muscle or gland.
What are the sites where the motor nerve impulse is transmitted from the nerve endings to the skeletal muscle cell membrane?
Neuromuscular Junctions Found in: Human Anatomy & Physiology 8th Edition by Elaine N. Marieb and Katja Hoehn
What does recruitment and frequency of stimulation affect?
Recruitment affects the number of motor units activated in a muscle, while frequency of stimulation affects the force generated by those motor units. Increasing recruitment leads to more muscle fibers being recruited, increasing force production, while increasing frequency of stimulation produces stronger muscle contractions by increasing the rate at which motor units are activated.
How does skeletal muscle stimulation produce a sustained contraction?
By stimulating alternating motor units at a time.
A reflex arc begins with the stimulation of a what?
A reflex arc begins with the stimulation of a sensory receptor such as those on the skin. The stimulus is then passed as an electrical impulse along sensory, relay and motor neurones (by-passing the brain) before reaching an effector orgen, like a muscle, which then responds to the stimulus.
The response of a motor unit to a single action potential of its motor neuron is called?
The response of a motor unit to a single action potential of its motor neuron is called a muscle twitch. This involves the contraction of all the muscle fibers within the motor unit in response to the stimulation from the motor neuron.
