Term
|
Definition
| The movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration. |
|
|
Term
| What is the purpose of Tissue Fluid surronding the Cells in the body? |
|
Definition
| The tissue fluid has a different concentration to the fluid inside a cell. This means that the water will either move into the cell from the tissue fluid or out of the cell by osmosis. If a cell is short of water the solution inside it will become more concentrated so the solution outside is more dilute and so water will move into the cell be osmosis. If a cell has lots of water the solution inside it will become more dilute and water will be drawn out of the cell and into the fluid by osmosis. |
|
|
Term
| Name three ways that exchange surfaces are adapted to maximise Gas and Solute exchange. |
|
Definition
1. Thin - so substances only have a short distance to diffuse.
2. Large Surface Area - so lots of substances can diffuse at once.
3. Lots of Blood Vessels. |
|
|
Term
| What happens when you breathe in? |
|
Definition
| The intercostal muscles and diaghragm contract. The thorax volume increases. This decreases the pressure drawing air in. |
|
|
Term
What happens when you breathe out? |
|
Definition
The intercostal muscles and diaghragm relax. The thorax volume decreases. This increases the pressure forcing air out.
|
|
|
Term
| How do Iron Lung Ventilators help patients to breathe? |
|
Definition
| Atmospheric pressure forces air into lungs. |
|
|
Term
| How do Modern Ventilators help patients to breathe? |
|
Definition
| Air is forced mechanically into lungs. |
|
|
Term
| Describe the journey of Oxygen as it enters the human body. |
|
Definition
| The air you breathe in goes through the trachea. This splits into two tubes called bronchi (each one is a bronchius) one going to each lung. The bronchi split into progressively smaller tubes called bronchioles. The bronchioles finally end at small bags called alveoli where gas exchange takes place. |
|
|
