20767166
Beschreibung
Karteikarten von Sana Mohmoodi, aktualisiert more than 1 year ago
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Erstellt von Sana Mohmoodi
vor fast 5 Jahre
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| Frage | Antworten |
| What are multicellular organisms? | Organisms that are made up of many cells |
| Give some examples of multicellular organisms | Humans, birds fish and insects |
| What is the meaning of specialised cells? | Cells that have a special job to do and have a structure that makes them better able. |
| How many cells do the human body contain? | It contains about 50 trillion cells |
| How many types of cells are in the human body? | There are more that 200 types of cells |
| Name the three types of muscles | - voluntary muscles (skeletal) - involuntary muscles (smooth) -cardiac muscles |
| Explain skeletal muscles | They are attached to the bones of your skeleton. They are for support and movement. Examples: biceps & triceps. |
| Explain involuntary muscles | They work without thinking about it. Like breathing and the food moving through the gut. |
| Why do voluntary and involuntary muscles contain a large number of mitochondria? | These muscles require a lot of energy to keep working. Mitochondria= energy |
| Explain cardiac muscles | They are the muscles that make up the heart. Have a stripped appearance. Do not get tired. |
| What are nerve cells? | They are cells that carry information in the body. |
| Meaning of axon? | Long fibres that extend from nerve cells and carry messages over long distances |
| What is the longest axon of a human nerve cell? | It is the one that reaches from the base of the spine to the toes. Can be more that a metre! |
| What are red blood cells? | Cells that carry oxygen from the lungs around the body. Also removed waste carbon dioxide |
| What are white blood cell? | They are part of the immune system and help the body to fight infections. |
| What are two types of fat cells? | Brown cells and white cells |
| What is the job of the brown fat cells? | To produce heat for the body, like when you are shivering. |
| What is the job for white fat cells? | To store energy. They form an insulating layer under the skin to keep a constant temperature. |
| Do plants have more types of cells or do animals? | Plants do not have as many types of cells than animals. |
| Explain specialised plant cells | Each type of cell has to carry out a different function within the plant. |
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