Tissues

Question 1

Skeletal muscle?

Answer 1

striated, doesn’t branch, fast contraction,

Question 2

Cardiac muscle?

Answer 2

Striated and has interpolated discs that holds cells together

Question 3

Gap junctions in muscle?

Answer 3

allows fast contraction as action potentials can pass quickly through

Question 4

Functional syncitium?

Answer 4

cells act as a continous cell, contract rapidly

Question 5

smooth muscle?

Answer 5

unbranched, unstriated, involuntary contractions, fatigue resistant but contraction slow

Question 6

Ca 2+ in contracting muscle role?

Answer 6

released from sarcoplasmic reticulum, binds to troponin so confirmational change and binding site for actin and myosin is exposed

Question 7

Mg 2+ role in contraction?

Answer 7

triggers breakdown of ATP causing myosin head to relax

Question 8

Features of epithelia tissue?

Answer 8

rests on basement membrane, avascular (no blood supply) functions to be a barrier, absorption and serratio. form from all 3 germ layers

Question 9

5 types of epithelia?

Answer 9

simple squamous - 1 cell thick e.g. peritoneal
simple cuboidal - for secretion, square
simple columnar - absorption, stomach
stratified columnar - protective in areas where abrasion occurs
Pseudo stratified - strethcable in trachea and bladder

Question 10

Connective tissue types?

Answer 10

reticular, elastin, collagen all derived from mesoderm.

All made from fibroblasts

Question 11

Schwann cells?

Answer 11

fat insulator around the axon to ensure saltatory conduction

Question 12

Microglia cells?

Answer 12

phagocytic cells that englulf harmful material surrounding the neurones

Question 13

Acetylcholine and Gutamate and gamma are?

Answer 13

neurotransmitters:

Ach = where meets muscle 
gutamate = excitatory in CNS
gamma = inhibitory

Question 14

How is excess neurotransmitter removed?

Answer 14

1. neuropeptides diffuse out of cleft and destroy
2. broken down in cleft by enzymes eg. acetylcholinesterase
3. Transported back to postsynaptic

Question 15

connective tissue layers around muscles?

Answer 15

epimyisum - tough around entire fibre
perimyisum - around bundles of monocytes
endomyisum - around individual monocytes