How are the alveoli adapted to their function?

Identify 3 ways

Gas exchange

Alveoli are very good at exchanging gases because…

1) They have a LARGE surface area

2) They have a good blood supply

3) They are moist

CO2

O2

Dangers of Smoking

Learning Objectives:

- To understand the dangers of smoking and how they affect the respiratory system

- To know the effects of some chemicals in cigarette smoke.

- To analyse data for smoking-related illnesses.

Tobacco

Anti Smoking Ad

Full Ad

Tobacco

Tobacco

Tobacco

Tobacco contains substances which cause:1. Lung cancer2. bronchitis and emphysema3. Heart disease + damage to blood vessels4. Pregnant smokers often have low weight

babies due to carbon monoxide in the blood reducing the oxygen supply to the baby

( Carbon monoxide irreversibly combines with the haemoglobin in red blood cells)

SmokingCigarettes contain 3 harmful things:

1. NICOTINE, which is an ___________ drug that raises the heart beat, narrows the arteries and so causes ____ _____ _____. This leads to heart _________.

2. TAR, which coats the lining of the _______ making them less able to take in oxygen. It also contains carcinogens which cause ______________.

3. CARBON MONOXIDE, which is a _______ ____ which joins up with ____ blood cells making them incapable of transporting _____________ around the body.

Words – high blood pressure, oxygen, red, addictive, disease, poisonous gas, lungs, cancer

Dangers of Smoking

Learning Objectives:

- To understand the dangers of smoking and how they affect the respiratory system

- To know the effects of some chemicals in cigarette smoke.

- To analyse data for smoking-related illnesses.