Respiration

Respiration is the release of energy from digested food using oxygen

OB9 describe the process of aerobic respiration by means of a word equation and understand that aerobic respiration requires the presence of oxygen

aerobic respiration

The Human Respiratory System

Humans Aerobically respire!

This respiration occurs in all the cells of the body.

Oxygen is carried to all these Cells by the red blood cells.

The Red blood cells get the Oxygen from the lungs.

While the red blood cells are at the lungs they exchange the Carbon Dioxide out of the blood and into the lungs.

Carbon Dioxide is one of the waste products of the Respiration reaction.

The Human respiration system is how Humans internally exchange these gases.

Key parts are the entry point of the air, the nose & mouth

The transport from the head to the lungs, the windpipe (TRACHEA)

The make up of the lungs is complex but easy to understand if you concentrate.


follow this link to observe how we inhale air ... http://www.smm.org/heart/lungs/breathing.htm

To demonstrate why our trachea needs cartlige to keep it open

  • take 2 sheets of paper (or balloons)
  • hold them a few centimeters apart
  • blow through the gap (or use a hairdryer)
  • What do you expect
  • observe the gap between the sheets

When air passes through a narrow place the pressure decreases which means that the tube will normally collapse.

Rings of cartilage are needed to keep the wind pipe open.

OB10 demonstrate the products of aerobic respiration

OB11 carry out qualitative tests to compare the carbon dioxide levels of inhaled and exhaled air

Respiration the Experiments

human breathing rate

OB12 describe how oxygen is taken into the bloodstream from the lungs and how carbon dioxide is taken into the lungs from the bloodstream during gaseous exchange and how these processes are affected by smoking

describe how oxygen is taken into the bloodstream from the lungs and how carbon dioxide is taken into the lungs from the bloodstream during gaseous exchange

Air is drawn into the body through the Nose, (somewhat filtered, Warmed & Moistened)

Air goes down your Trachea (windpipe)

Then it goes through Bronchus → Brochioles → Alveoli

Alveoli have a large surface area

Each Alveoli is lined with very thin blood vessels (capilliaries)

The Capillaries have very thin walls, that allow gases to cross from the lungs in to the blood, and from the blood in to the lungs, and the walls of the Alveoli are also thin.

The air is then expelled from your lungs (with more Carbon Dioxide & Water than went in (but less Oxygen))

Alveoli have a large surface area.

This allow the O2 and the CO2 more chance to be exchanged.

Blood flows slowly across the Alveoli, but because there are so many Alveolus we get the oxygen we need!