Introduction - Systems and Nervous Tissues

Question 1

Two major subdivision of the nervous system? What are the structures comprising each subdivision

Answer 1

(CNS) - Central Nervous System, consists of brain and spinal cord
(PNS) - Peripheral Nervous System, consists of nerves outside the CNS

Question 2

Two main types of cells that make up nervous system?

Answer 2

Supporting cells and Neurons

Question 3

Describe general function of the support cells

Answer 3

• neuroglia and glial cells
• They have a variety of cells that support, insulate, and protect the delicate neurons

Question 4

Three parts of the neuron and their function

Answer 4

( Cell Body ) - Metabolic centre of the cell (1) It contains the nucleus (2)

( Processes ) - Armlike projections from both ends from the cell (1)
Includes
- Dendrites
- Axon
- Axon Terminal

( Myelin Sheaths ) - Covering composed of a whitish fatty material (Myelin) (1) Insulates fibers (2) Increases rate of transmutation of nerve impulses (3)

Question 5

What is a Synapse and the role of neurotransmitters in this junction?

Answer 5

Gaps between neurons is called synapse. Neurotransmitters diffuse across synapse to continue cell communication.

Question 6

Three function classifications of neurons based on direction of nerve impulses

Answer 6

Sensory, Motor, and Interneurons

Question 7

Sensory Impulses

Answer 7

Impulses from receptors such as the skin to the CNS

Question 8

Motor Impulses

Answer 8

Carry impulses from the CNS to a muscle or gland

Question 9

Interneuron Impulses

Answer 9

Connect sensory and motor neurons in the CNS