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Questions and Answers
What percent of the body is composed of water?
What percent of the body is composed of water?
What is the weight of lipids in a 65 kg person?
What is the weight of lipids in a 65 kg person?
Which of the following elements is NOT a macro element?
Which of the following elements is NOT a macro element?
What is the approximate weight of protein in a 65 kg person?
What is the approximate weight of protein in a 65 kg person?
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What percentage of the body is composed of minerals?
What percentage of the body is composed of minerals?
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Which element is NOT a micro element?
Which element is NOT a micro element?
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What is the total weight of water and protein in a 65 kg person?
What is the total weight of water and protein in a 65 kg person?
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Which of the following is a macro element?
Which of the following is a macro element?
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What percentage of the body is composed of lipids?
What percentage of the body is composed of lipids?
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What is the weight of minerals in a 65 kg person?
What is the weight of minerals in a 65 kg person?
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Study Notes
Importance of Water in Living Organisms
- Water is the most abundant molecule in the body, making up 60% of an adult's body weight, and is essential for life.
- Water is a universal solvent, enabling easy interactions between molecules without forming strong ionic or covalent bonds.
- It is possible to survive without food for over a month, but dehydration can lead to death within a week.
- Water is a reactant and plays a crucial role in maintaining a stable pH and electrolyte balance.
Characteristics of Life
- Life is characterized by regular structure, reproduction, growth, response to environment, energy processing, regulation, and evolutionary adaptation.
- These characteristics are essential for life to exist and thrive.
Hierarchy of Life
- Biome: The entire ecosystem on Earth, including water, land, and air.
- Ecosystem: A specific region with all living organisms, water, land, and air.
- Community: All living organisms within an ecosystem.
- Population: A group of individuals of the same species.
- Organism: A single living being.
- Organ and organ systems: Functional units within an organism.
- Tissue: A group of similar cells.
- Cell: The basic unit of life.
- Organelle: A subcellular structure with specific functions.
- Molecule: A group of atoms.
- Atom: The smallest unit of matter.
Molecular Composition of the Body
- In a 65 kg person, the body composition is:
- Water: 61.6% (40 kg)
- Protein: 17.0% (11 kg)
- Lipid: 13.8% (9 kg)
- Minerals: 6.1% (4 kg)
Elemental Composition of the Body
- Macro elements: O, C, H, N, Ca, P, K, S, Na, Cl, Mg
- Micro elements (trace elements): essential for bodily functions, but present in small amounts
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Description
Learn about the essential role of water in living organisms, its functions, and why it's crucial for life. Understand its importance in maintaining pH and electrolyte balance.
