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The body's internal environment remaining the same, despite any external environment changes.
What are the 3 main components of a regulatory control system in the body?
- control centre
What are 2 mechanisms that operate to restore homeostasis after infection?
- immune system responds to destroy pathogens
- skin cells inflame injury site
What are 2 mechanisms by which responses to stimuli are brought about and coordinated?
- the nervous system
- the hormonal system response
What are 2 ways in which water and ion balance are maintained?
- digestive organs = take in and eliminate waste
- kidneys = maintain a regulate water and ion balance
What are 2 ways in which the body regulates its respiratory gases during exercise?
- the heart rate increases
- the breathing rate increases
How did Robert Hooke contribute to the cell theory?
- discovered substances that are made of boxlike structures called cells by examining slices of cork and other plant tissue using a microscope
How did Anton van Leeuwenhoek contribute to the cell theory?
- found single-celled organisms using microscope lenses he built
How did Scheiden contribute to the cell theory?
- developed the theory that all plants were made of cells
How did Schwann contribute to the cell theory?
- proposed that all animals are made of cells
What are the 3 points in the cell theory?
- all cells are made up of one or more cells and the products of those cells
- all cells carry on life activities
- new cells can only arise from living cells through cell division
What is the function of the cell membrane?
- gives the cells shape and protection and controls what leaves and enters the cells
What is the function of ribosomes?
- where protein is built
What is the function of mitochondria?
- releases energy for the cell to use
What is the function of the golgi body?
- serve as processing, packaging, and storage centres for the products released in the cell
What is the function of the ER?
- transports materials throughout the cell
What is the function of chloroplasts?
- allows plants to make their own food through photosynthesis
What is the function of the cell wall?
- surrounds the cell, provides strength and structure
What is the function of cytoplasm?
- contains organelles
What is the function of nucleolus?
- makes ribosome parts
What is the function of centrioles?
- involved in cell division in animal cells
What is the function of cilia and flagella?
- involved in cell movement
What is the function of lysosomes?
- involved in the digestion of food for the cell
What is the function of the vacuole?
- digests food and may also serve as a storage site for water
What is the function of nucleus?
- the control centre of the cell metabolism and reproduction