Podcast
Questions and Answers
Which type of molecules do most food sources depend on?
Which type of molecules do most food sources depend on?
What is the process called that involves transferring a source of energy from outside to the inside of an organism?
What is the process called that involves transferring a source of energy from outside to the inside of an organism?
Which process in the body uses oxygen to break down food sources?
Which process in the body uses oxygen to break down food sources?
Why do multicellular organisms need a transportation system for food and oxygen?
Why do multicellular organisms need a transportation system for food and oxygen?
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What can be a by-product of using a carbon source and oxygen for energy generation in organisms?
What can be a by-product of using a carbon source and oxygen for energy generation in organisms?
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Which of the following is NOT necessary for maintaining living structures?
Which of the following is NOT necessary for maintaining living structures?
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Why is a series of chemical reactions necessary in the body of an organism?
Why is a series of chemical reactions necessary in the body of an organism?
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What is the primary function of specialised tissues in multicellular organisms in relation to food and oxygen uptake?
What is the primary function of specialised tissues in multicellular organisms in relation to food and oxygen uptake?
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What determines the type of nutritional process an organism uses?
What determines the type of nutritional process an organism uses?
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What must occur if the organism's body size is to increase?
What must occur if the organism's body size is to increase?
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Study Notes
Life Processes
- Even when asleep, the body needs to maintain itself through life processes that prevent damage and breakdown.
- These life processes require energy, which comes from outside the body in the form of food through nutrition.
- Nutrition involves transferring energy from outside the body to the inside, and also provides raw materials for growth.
Nutrition
- The body requires energy from outside sources, which can be varied and need to be broken down or built up in the body.
- A series of chemical reactions are necessary to convert energy sources into a uniform energy form that can be used for maintaining living structures and growth.
- Oxidising-reducing reactions are commonly used to break down molecules, and many organisms use oxygen from outside the body for this process.
Respiration
- Respiration is the process of acquiring oxygen from outside the body and using it to break down food sources for cellular needs.
- Single-celled organisms do not need specific organs for respiration, but multi-cellular organisms require specialized tissues for this function.
Adaptation of Organisms
- In multi-cellular organisms, not all cells are in direct contact with the environment, so specialized tissues are needed for functions like food uptake and oxygen exchange.
- This leads to the need for a transportation system in the body to carry food and oxygen from one place to another.
Excretion
- Chemical reactions that generate energy create by-products that are harmful to cells, and need to be removed from the body through excretion.
- Excretion is essential to prevent damage and destruction of the organism, and maintain life.
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Description
Learn about the essential life processes that occur in the human body, including nutrition, and how they require energy from outside sources
