Questions and Answers
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?
Which process in the body uses oxygen to break down food sources?
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?
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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?
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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?
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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