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CIT - Cells
Cells revision
| Question | Answer |
|---|---|
| Chemical reactions underlie all body processes, what are they? | 1. Movement 2. Digestion 3. Contraction (cardiac) |
| Cells are building blocks for all living things. What are the 4 main elements of a cell? | 1. Oxygen 2. Carbon 3. Nitrogen 4. Hydrogen |
| Cells contain approx what % of water? | 60% |
| What is intracellular fluid? | a soloution containing small amounts of gases, nutrients and salts dissolved in water. |
| What is interstitial fluid? | Fluid that surrounds the exterior of a cell and the site of exchange between blood and cells. |
| Name 3 functions common to all cells. | 1. Digest foods 2. Excrete waste products 3. Respond to stimuli |
| Name the 3 main parts of a cell. | 1. Nucleus 2. Cytoplasm 3. Plasma Membrane |
| What is a plasma membrane? | The transparent outer layer of a cell. |
| Plasma Membrane | .transparent outer layer of a cell. .enzymes .receptor sites for hormones .transports proteins that allow the membrane to be semi permeable |
| Permeability | property of membranes that allow the passing of molecules or ions |
| Selective permeability | .barrier that allows some substances to pass through while excluding others. |
| Passive transport | .substances are transported across a membrane without the aid of energy. .Diffusion .Filtration |
| Diffusion | .Molecules move from an area of high concentration to an area of low concentration along a concentration gradient. .molecules tend to scatter themselves throughout the available space. .diffusion occurs if the molecules are small enough and fat soluble. |
| Filtration | .movement of water and solutes through a membrane by hydrostatic pressure (pressure is exerted by blood). .Filtration is used by the kidneys to form urine. .blood cells and protein too large are held back. |
| Osmosis | movement of water through a selectively permaeable membrane along its concentration gradient. |
| Active transport | occurs when the substance: .is too big to pass through the pores .is fat in-soluble .is travelling against a concentration gradient |
| Acid | is a substance that can release hydrogen ions. |
| Ph | describes the acid base concentration |
| Which organs regulate blood ph? | lungs and kidneys |
| Blood scale is... | 7.35-7.45 |
| True or false.....Living cells are sensitive to acid/base changes.... | True |
| Proteins accound for over ----% of organic matter in the body? | 50% |
| Name 4 functions of proteins in the body. | 1.Antibodies 2.Hormones 3.Transport proteins 4.Enzymes |
| Antibodies | specialised proteins that bind with and inactivate bacteria, toxins and some viruses |
| Hormones | help regulate growth and development |
| Transport proteins | carry's substances like medications and oxygen |
| Enzymes | makes chemical reactions work better. |
Created by:
Dragish
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