1505021
Description
Flashcards by Millie Berrett, updated more than 1 year ago
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Created by Millie Berrett
about 11 years ago
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| Question | Answer |
| What is a specialized cell? | A cell becomes specialized when it has particular structures to help them carry out different tasks and functions |
| Functions and adaptations of Red Blood cells? | -transport oxygen from the lungs to the tissues. -filled with haemoglobin which allows it to carry oxygen. -no nucleus to allow space for haemoglobin -flexible so can fit through cappilaries |
| Functions and adaptations of Muscle cell | -Contracts so the structures can be brought together -Long cells which have lots of fibres in the cytoplasm -Fibres can shorten the cell when energy is available |
| Functions and adaptations of ciliated cells | -Have a layer of tiny hairs which can move mucus |
| Functions and adaptations of Motor nerve cell | -Conducts nerve impulses -Has long fibre which impulses travel along -many branched end which can connect to other cells |
| Functions and adaptations of a Root hair cell | - Absorbs minerals and water -Long extension to increase surface area -increased surface area improves absorption of materials |
| Functions and adaptations of Xylem vessel | -Transports water easily due to no cytoplasm -Supports the plant -Strong walls strengthened by a waterproof substance called lignin |
| What is a tissue? | A tissue is a group of cells with similar structures working together to perform a shared function (Epithelium lining in the intestine) |
| What is an organ? | An organ is a group of tissues working together to perform certain functions (Intestine) |
| What is an organ system? | An organ system is a group of organs with related functions working together to perform body functions (Digestive system) |
| Define diffusion | Diffusion is the net movement of molecules within a gas or liquid from a region of high concentration to a region of lower concentration as a result of their random movement until an equilibrium is reached |
| How have living organism adapted to speed up diffusion? | -Diffusion distances are short -Concentration gradients are maintained -Diffusion surfaces are large |
| Define osmosis | Osmosis is the diffusion of water molecules from a region of higher concentration of water molecules to a region of lower concentration of water molecules (down a water potential gradient) through a partially permeable membrane |
| Define active transport | Active transport is a method by which particles can cross membranes even against a concentration gradient |
| Diagram of active transport |
Image:
Active_transport (image/jpg)
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