tissues 1

Question 1

muscle tissue

Answer 1

1-made up of long thin cells called fascicles
2-lots of fascicles bundled together form a muscle fibre
3-can contract to shorten spaces
4- 3 different types ( skeletal and cardiac which are striated, smooth which is non-straited)

Question 2

nervous tissue

Answer 2

made up of neurone cells and support cells.

generates, transmits electrical impulses.

Question 3

primary function of the epithelia?

Answer 3

1-covers surfaces
2-separates compartments
3-keeps cells connected

Question 4

secondary function of the epithelia

Answer 4

1-forms glands
2- wear and tear-thick
3-allows gas diffusion-thin
3-absorption-microvilli
4-movement-cilia

Question 5

what are cilia?

Answer 5

microtubules arranged in a 9+2 ring structure

Question 6

different types of cell-cell junctions?

Answer 6

1-desmosomes or adhering-anchor. made up of 2 proteins and the ECM. not water tight.
2-occluding or tight- water tight. seal- in gut for bacteria
3-gap/communicating

Question 7

how is the epithelia connected to the deep-rooted tissues?

Answer 7

1- through the basement membrane
2-made up of the basal lamina: solid but flexible
and the reticular lamina: fibrous

Question 8

classification of simple epithelial tissue?

Answer 8

1- squamous-flattened,irregular
2-cuboidal: width=height
3-columnar- taller than wider

Question 9

classification of stratified epithelial tissue?

Answer 9

1-squamous: many flattened layers, fewer as you get closer to surface
2-cuboidal and columnar; 2 layers
3-pseudostratified: seems like many different layers but actually different shaped cells all anchored to BM
4- transitional: toxic and waterproof resistant.

Question 10

glands

Answer 10

single or multicellular secretory epithelial cells.

can be exocrine or endocrine

Question 11

describe the epithelial component of liver and kidney

Answer 11

Liver:

• hepatocytes
• arranged in rows
• multiple functions including secretion
• support cells line blood vessels and bile ducts

Kidneys:

• arranged into nephrons
• multiple functions including filtration of blood, partial absorption of filtrate
• support cells support blood vessels and renal pelvis