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Cell Activity

Cell Activity. Contents. Plant Cells vs. Animal Cells Specialised Cells Specialised Animal Cells Cells, Tissues, Organs and Systems Diffusion & Osmosis Partially Permeable Membrane Mitosis Meiosis Mitosis vs. Meiosis. Plant cells, Animal cells. Only plant cells have these: Cell wall

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Cell Activity

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  1. Cell Activity

  2. Contents • Plant Cells vs. Animal Cells • Specialised Cells • Specialised Animal Cells • Cells, Tissues, Organs and Systems • Diffusion & Osmosis • Partially Permeable Membrane • Mitosis • Meiosis • Mitosis vs. Meiosis

  3. Plant cells, Animal cells • Only plant cells have these: • Cell wall • Large vacuole • Chloroplasts • Both types of cell have these: • Nucleus • Cytoplasm • Cell membrane • Mitochondria – Energy is released here by respiration

  4. Specialised Cells Root hair cell in PLANTS: • It is adapted to do its job of taking in water and nutrients by having: • a large surface area • a thin cell membrane The sperm cell is an example of a specialised ANIMAL cell:

  5. Specialised Animal Cells Red Blood Cell - Carries oxygen around the body Adaptations - No nucleus, large surface area, so maximum area for oxygen carriers: haemoglobin White Blood Cell – Fight disease, some make antibodies Adaptations - Irregular shape, they can change shape to squeeze out of blood vessels and get to the site of infection. Others have cytoplasm which can flow making it possible for the cell to change shape, surround and engulf bacteria. Can increase in numbers to fight disease.

  6. Cells, Tissues, Organs and Systems All living things are made up of cells… A group of CELLS e.g. Heart Muscle makes up a TISSUE e.g. Heart Muscle Tissue A group of TISSUES makes up an ORGAN e.g. Heart A group of ORGANS makes up a SYSTEM e.g. Circulatory System A group of SYSTEMS make up an ORGANISM e.g. Humans

  7. Diffusion & Osmosis • Diffusion = movement of molecules, from a region of high concentration to a region of low concentration. • - Oxygen diffuses into cells, and the waste carbon dioxide diffuses out. • Osmosis = movement of water molecules, across a partially permeable membrane, from a region of high concentration of water to a low concentration of water molecules. • It allows plants to take in water through their roots. • It is used in kidney dialysis machines to filter the blood.

  8. Partially Permeable Membrane Small molecules, such as water can pass through the small holes in the membrane… But larger molecules like sugar cannot pass through the membrane.

  9. Cell Division Mitosis and meiosis are the two types of cell division. Mitosis enables growth and repair to occur. Meiosis is for the production of sex cells.

  10. Mitosis is a process of cell division which results in the production of two daughter cells from a single parent cell. The daughter cells are identical to one another and to the original parent cell. Mitosis (Asexual) Each chromosome replicates

  11. Meiosis is thetype of cell division by which germ cells (eggs and sperm) are produced Meiosis (Sexual)

  12. Mitosis vs. Meiosis • Meiosis: • Used to produce gametes for sexual reproduction • Each daughter cell has half the number of chromosomes of the parent • (23 in humans) • Mitosis: • Used for growth and repair of cells • Used in asexual reproduction • Cells with identical number of chromosomes and genetic information are produced • (46 in humans)

  13. Summary • Specialised cells are adapted for a specific function e.g. root hair cell, red blood cell • Cells  tissues  organs  systems  organism • Diffusion = movement of particles from a region of high concentration to low concentration e.g. alveoli • Mitosis = asexual reproduction. Daughter cells have the same number of chromosomes as parent cells • Meiosis = sexual reproduction. Daughter cells (gametes) have ½ the number of chromosomes as parent cells

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