Muscle and Nervous Tissue

Question 1

Muscular Tissue Characterisitics

Answer 1

• Cellularity (more cells than matrix)
• High Vacularity (high demand for O2, C6H12O6, H2O & wast removal.)
• Tremendous relationship with nervous system.
• Cells are lifelong & in Permanent GO (growth arrest)
  
  • Exception is smooth m+ of uterus during pregnancy
  • If m+ dies, it’s replaced with dense CT (scar tissue) which is strong but not contractile.

Question 2

Types of Muscle Tissue

Answer 2

Skeletal m+

Cardiac m+

Smooth m+

Question 3

Skeletal m+ characteristics

Answer 3

• Can only contract & get shorter
• Pull as a team
• Voluntary
• Long, lots of nuclei and mitochondria
• Increase in size with use
• Striated
• (A & I Bonds)

Question 4

Cardiac m+ Characterisitics

Answer 4

• Only one nuclei
• Cells are short & branched
• Self contracting
• Use Free FattyAcids (FFA) as fuel.
• Gap junctions form intercalculated discs-contract as a unit

Question 5

Smooth m+ Characteristics

Answer 5

• Form walls of hollow organs, medium & large blood vessels, branchiole tubes
• Involuntary > sensitive to nerve stimulation and hormones
• Very strong & can hold a contraction longer than skeletal.
• Can come out of GO in special circumstances.
• Not Striated
• Tapered Ends

Question 6

Nervous Tissue Characterisitics

Answer 6

• Lifelong (permanent GO) & require the greatest up keep
  
  • Have their own “support staff” called glia cells
• High nutrient need= HIGH VASCULARITY
  
  • ​Can’t survive long being cutoff from O2 or glucose
• Glia cells are in reversable GO & can even respecialize (Change jobs-turn into a brain tumor)
  
  • Can be a source of brain tumors

Question 7

What is a cell?

Answer 7

A neuron

Question 8

Neuron

Answer 8

Carry messages from one to another using electrical charges or chemicals

Question 9

Dendrite

Answer 9

Receives the message

Question 10

Perikaryon

Answer 10

Cell body (peri=around, keeps nucleus)

Question 11

Axon

Answer 11

Carries message away from cell body

Question 12

Bouton

Answer 12

Release or send the message on

Question 13

Synapse

Answer 13

Space that the message has to travel to reach the dendrite of the next neuron

Question 14

Synaptic Vessels

Answer 14

Carries message until it reaches the end of the bouton vessel

-Releases messages through exocytosis

Question 15

What do cells contain

Answer 15

contractile proteins- actin & myosin.