C02, P01 - K - Nervous System Flashcards
(21 cards)
The neuron cell body contains…
A nucleus, lysosomes, mitochondria, and a Golgi complex.
The axon…
is the part of the neuron that provides communication from the brain and spinal cord to other parts of the body.
The PNS consists of…
12 cranial nerves, 31 pairs of spinal nerves, and sensory receptors.
The PNS has two main functions…
- Enable nervous system to activate effector sites.
2. Relay information from effector sites back to the brain.
The PNS is divided into two systems…
- Somatic
2. Autonomic
The somatic nervous system (SNS) consists of…
Nerves that serve the outer areas of the body and skeletal muscle, and are responsible for the voluntary control of movement.
The autonomic nervous system (ANS) supplies…
Neural input to the involuntary systems of the body (heart, digestive, endocrine).
The ANS is divided into two systems…
- Sympathetic
2. Parasympathetic
The sympathetic nervous system serves to…
Increase levels of activation in preparation for activity.
The parasympathetic nervous system serves to…
Decrease levels of activation during rest and recovery.
The four types of sensory receptors are…
- Mechanoreceptors
- Nociceptors
- Chemoreceptors
- Photoreceptors
Mechanoreceptors respond to…
Mechanical forces (touch and pressure).
Nociceptors respond to…
Pain (pain receptors).
Chemoreceptors respond to…
Chemical interaction (smell, taste).
Photoreceptors respond to…
Light (vision).
Mechanoreceptors are located in…
Muscles, tendons, ligaments, and joint capsules and include muscle spindles, Golgi tendon organs, and joint receptors.
Muscle spindles run…
Parallel to muscle fibers.
Golgi Tendon Organs (GTOs) are located at…
The point where skeletal muscle fibers insert into the tendons of skeletal muscle.
Activation of the GTO will cause…
The muscle to relax.
Joint receptors are located…
In and around the joint capsule.
Joint receptors act to signal…
Extreme joint positions to help prevent injury.
