Lecture 2

Question 1

What are some of the functions of the nervous system

Answer 1

homeostasis, pain sensation, thoughts, feelings, memories, emotions, sleep, perceptions of the senses, movements and behavior(both innate and voluntary) and reproductive function

Question 2

What are the 4 zones of a neuron

Answer 2

input, summation, conduction and output

Question 3

What are the 4 morphological types of neurons

Answer 3

Multipolar, bipolar, unipolar and anaxonic

Question 4

What forms the myelin sheaths in which areas and how many axons does one cell cover

Answer 4

Oligodendrocytes- CNS and covers around 50 different axons

Schwann cells- PNS and only covers one axon

Question 5

What are the main cells in the CNS and what do they do

Answer 5

Oligodendrocytes(myelin sheath), astrocytes(support in all forms), microglia(immune response) and ependymal cells(circulate cerebrospinal fluid)

Question 6

What are the main cells in the PNS and what do they do

Answer 6

Schwann cells ( myelin sheath) and satellite cells (Support in all forms)

Question 7

Whats the 2 types of synapses and how do they work

Answer 7

Electrical and chemical

electrical-happens through gap junctions, is fast, allows for ions to flow, may be bidirectional

Chemical- Is much slower, relies on chemicals to cross, more complex event and information, NT in vesicles, the synapse strength can be modified. ONLY unidirectional

Question 9

Whats the difference between signalling within a cell and signalling between cells

Answer 9

Within a nerve cell signalling is electrical while between cells signalling is chemical