Central Nervous System

Question 1

divisions of the CNS and PNS

Answer 1

Central Nervous System (CNS)

1. Brain
2. Spinal Cord

Peripheral Nervous System (PNS)

1. Autonomic division
   - Regulates internal environment
   - Carries info from the CNS to organs, blood vessels and gland
   - Sympathetic (fight or flight)
   - Parasympathetic (rest and digest)
2. Somatic division
   - Carries info to the CNS from proprioceptive structures and from the CNS to muscles

Question 2

what did Luigi Galvani find?

Answer 2

by electricity flowing through a dead frog’s body, it would cause muscles to be innervated

Question 3

what do glial cells do

Answer 3

1. Surround and secure neurons in place
2. Supply nutrients and oxygen to neurons
3. Insulate neurons from one another
4. Destroy pathogens

Question 4

components of a motor unit

Answer 4

1. Extrafusal muscle fiber (contract and make movement)
2. Intrafusal muscle fiber (sense change in stretch/position of muscle)
3. Alpha (a) motor neuron (innervate extrafusal muscle fibers)
4. Gamma (y) motor neuron (innervate intrafusal muscle fibers)

Question 5

types of neurons

Answer 5

1. Motor (efferent) neurons
2. Sensory (afferent) neurons

Question 6

Cerebral Cortex (Cerebrum)

Answer 6