Internal Surfaces Of The Body

Question 0

Describe serous membranes

Answer 0

Thin, two part membrane that lines closed body cavities
E.g. Peritoneum (abdominal organs), pleural (lungs), pericardial (heart)
Secrete lubricating fluid that promotes friction free movement of structures
Consists of: mesothelium(simple squamous) that secretes lubricating fluid
Thin layer of connective tissue that attaches epithelium to adjacent tissues

Question 1

Describe mucous membranes

Answer 1

Line internal tubes that open to the exterior e.g. Alimentary, respiratory, urinary
Consist of: epithelium lining the tube
Adjacent layer of connective tissue
In alimentary tract 3rd layer of smooth muscle

Question 2

Describe the structure of the alimentary tract

Answer 2

Mucosa
Submucosa
External muscle layer
Serosa

Question 3

Describe structure of oesphagus

Answer 3

Mucosa- simple squamous non keratinised, lamina propria, muscularis mucosae
Submucosa - subtending layer of connective tissue and mucous secreting glands
Muscularis externa - smooth muscle kayers - peristalsis
Adventia - this outermost layer of connective tissue

Question 4

How is structure of GI mucosae related to its function?

Answer 4

Muscularis externa - smooth muscle contracts to move food by peristalsis

Question 5

How is structure of Urinary mucosae related to its function?

Answer 5

Can distend to accomodate urine

Epithelium has tight junctions - impermeable

Question 6

How is structure of respiratory. mucosae related to its function?

Answer 6

Hyaline cartilage wall for support

Alepveoli have lots of capillaries for gaseous exchange