Tissue Types

Question 1

What are the 4 tissue types in the body?

Answer 1

1. Nervous
2. Muscular
3. Epithelial
4. Connective

Question 2

What are the 3 ways light can be?

Answer 2

Absorbed
Transmitted
Reflected

Question 3

How many bones is the orbit made up of?

Answer 3

7

Question 4

What are the 6 muscles of the eye?

Answer 4

• superior oblique
• superior rectus
• medial rectus
• lateral rectus
• inferior rectus
• inferior oblique

Question 5

When light rays impinge on the surface of the eye, what does it encounter/hit ?

Answer 5

(photon) hits the tearfilm

Question 6

What is the outer coat of the eye ?

Answer 6

Sclera (opaque)

Question 7

What is the front of the eye modified to ?

Answer 7

Transport cornea

Question 8

What is the corneoscleral junction?

Answer 8

Limbus

Question 9

After traversing the anterior chamber , what happens to the light

Answer 9

It reaches the lens

Question 10

How does light focus on the retina?

Answer 10

By the cornea and lens acting together

Question 11

What is the choroid?

Answer 11

Its is between the retina and sclrera which contains the vascular blood supply to the retina

Question 12

How are the transparent cornea and lens avascular?

Answer 12

Because they recieve nutrients from the aqueous humour which fills the anterior chamber.

Question 13

What fills the posterior chamber?

Answer 13

Filled with jelly like vitreous humour

Question 14

Where are the 2 groups of muscle in the eye?

Answer 14

Iris- which can alter the size of the pupil

Cilary body- change the shape of the lens during the process of accomadation.

Question 15

What is the bulk of the tear film produced by?

Answer 15

Lacrimal Gland

Question 16

What tissue makes up most of the retina?

Answer 16

Nervous tissue

Question 17

What are the nerve cells known as?

Answer 17

Neurones

Question 18

What structures are the nerve cells associated with in the eye?

Answer 18

cornea (sensory)

cilary (motor)

Question 19

What are the 2 types of muscle tissue?

Answer 19

Skeletal muscle

smooth muscle

Question 20

What is the structure of skeletal muscle?

Answer 20

attached to skeleton
striated in appearance
capable of generating a lot of force

Question 21

What is the structure of smooth muscle?

Answer 21

often found in hollow organs
non-striated in appearance
capable of sustained activity

Question 22

What are the 2 types of epithelial?

Answer 22

Covering epithelia

Glandular epithelia

Question 23

What is covering epithelia?

Answer 23

line the free surfaces of the body.

Question 24

What are the 4 functions of epithelia?

Answer 24

Protection via skin
absorption via digestive tract
filtering via kidney
sensation (taste smell)

Question 25

What are the shape of epithelial cells?

Answer 25

Usually polyhedral (hexagonal) with strong attachments between adjacent cells

Question 26

What can the surfaces of the epithelial cells be?

Answer 26

Smooth | -Covered with microvilli or cilia

Question 27

What does the covering epithelial cell rest on?

Answer 27

Basement membrane

Question 28

What is epithelial tissue?

Answer 28

Highly regenerative, avascular and can be inervated by both sensory and nerve fibres.

Question 29

What are the 3 shapes of covering epithelia?

Answer 29

Squamous (flat) Cuboidal Columnar

Question 30

What are the 8 basic types of covering epithelia?

Answer 30

simple squamous simple cuboidal simple columnar pseudo stratified stratified squamous stratified cuboidal stratified columnar transitional

Question 31

How many layers are the human cornea?

Answer 31

5

Question 32

Good example of simple squamous epithelia

Answer 32

Corneal stroma and corneal endothelium

Question 33

Good example of stratified squamous epithelia?

Answer 33

Corneal epithelihum as it protects from dirt, eyelids.

Question 34

Where are stratified epithelia usually found?

Answer 34

areas subject to abrasion such as oesophagus and vagina

Question 35

What is a specialised form of stratified epithelium?

Answer 35

keratinsed epithelium of the skin

Question 36

What is a transitional epithelium?>

Answer 36

When the cell shape can change. | E.G bladder - epithelia is stretched when bladder is filled.

Question 37

Why is single layered epithelia not good for protection?

Answer 37

as they are single and are good for areas where the exchange of substances is required.

Question 38

Other general examples of simple squamous epithelia

Answer 38

lining of blood vessels | alveoli of the lungs

Question 39

Examples of simple cuboidal

Answer 39

kidney | sebaceous gland

Question 40

example of simple columnar

Answer 40

gall bladder cilia microvili

Question 41

What is pseudo- stratified epithelium?

Answer 41

All cells sit on the basement membrane appearing startified as all cells are in different shape but is actually simple as they are all the same cells.

Question 42

what is the adnexa of the eye?

Answer 42

. extra ocular muscle . conjunctiva . lacrimal gland . eyelids

Question 43

what is conjunctiva?

Answer 43

membrane lines back surface of eyelid and exposed bit of sclera. stops near the limbus

Question 44

Where is melanin found too?

Answer 44

in the epithelial cells for skin colour | also many epithelia lining the inside of the eye have melanin

Question 45

What does the melanin in the eye do?s

Answer 45

serves to absorb stray light and improve image quality.

Question 46

What are some e.gs of the smooth muscle in the eye?

Answer 46

iris and ciliary body

Question 47

What are some of the e.g of the skeletal muscle in the eye?

Answer 47

eyelid muscles- e.g obicularis oculi | 6 extraocular muscles