Section 2 Task 2.

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Presentation transcript:

Section 2 Task 2

Stomach The stomach has 3 layers of non-striated muscle in its wall and an inner lining of columnar epithelium with goblet cells. Areolar tissue connects the stomach lining with the muscular coat.

Function The function of the stomach is to mix chewed food with hydrochloric acid. This acid is an ideal environment for digestive enzymes to work at their optimum.

Role of stomach muscles in digestion The muscle tissues help to churn up food and is involved in the process of peristalsis. Peristalsis = a wave like muscle contraction moving food along the digestive tract. Muscle tissues also responsible for controlling the opening and the closing of the sphincter.

Goblet cells Goblet cells or columnar epithelial cells produce acid, digestive enzymes such as amylase, protease and lipase. They also produce mucus.

Areolar tissue Areolar tissue is responsible for holding the layers of the stomach together, similar to plywood, hence the thinness of the structure.

Skin It protects the body from exposure to micro-organisms and chemicals which could cause harm to the body.

It also regulates body temperature.

Muscle tissue Adipose tissue Epithelial tissue Areolar tissue 5 Main layers of tissues Muscle tissue Adipose tissue Epithelial tissue Areolar tissue Nervous tissue

Muscle tissue pull down the hair on our skin which acts as an insulating mechanism. When erect, the hair traps a layer of air for insulation. Adipose tissue acts as an insulator and a shock absorber, it protects vital organs. Stratified epithelium acts as a protective barrier and has the ability to repair the skin if it is damaged.

Cuboidal epithelium are located by the sweat ducts and has the function of cooling the skin down. Areolar tissue joins the skin to the muscle layer beneath and reinforces the skin structure.

Nervous tissue – relay nerve impulses generated from the specialised skin sensory receptors for heat, touch, pain and pressure and in turn informing the brain of any environmental changes.