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B1- Cell biology (Specialised cells (The sperm cell is adapted by being…
B1- Cell biology
Specialised cells
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Leaf palisade cell has a large surface area for efficient gas exchange and lots of chloroplasts to absorb sunlight for photosynthesis.
The red blood cell is adapted to its function by having a large surface area for efficient absorption of oxygen.
The cillated cell has tiny hairs that filter out dust from the air as you breathe also moving along mucus.
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Chromosomes and mitosis
Mitosis is important because it is essential for growth and repair in the body. Mitosis happens when a parent cell divides, creating two identical copies, referred to as daughter cells. ... During this process, it is essential that the daughter cells are exactly the same with the same copies of DNA.
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Stem cells
Stem cells are a class of undifferentiated cells that are able to differentiate into specialized cell types. Commonly, stem cells come from two main sources: Embryos formed (embryonic stem cells) and. Adult tissue (adult stem cells).
Cell therapies would use stem cells, or cells grown from stem cells, to replace or rejuvenate damaged tissue.
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Diffusion
Diffusion occurs when particles spread. They move from a region where they are in high concentration to a region where they are in low concentration. Diffusion happens when the particles are free to move.
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Osmosis
It occurs when water molecules pass through a partially permeable membrane. Some membranes in plant and animal cells allow certain particles to pass through them but not others. ...
Osmosis is the overall movement of water from a dilute solution to a more concentrated solution through a partially permeable membrane.
Active Transport
the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.
Examples of active transport include the uptake of glucose in the intestines in humans and the uptake of mineral ions into root hair cells of plants.
