Fundamental Chemical Principles in Anatomy & Physiology

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Understanding the basic chemical principles is essential for studying Anatomy & Physiology, as all biological processes are rooted in chemistry.

Matter: Anything that has mass and occupies space.
Mass vs. Weight: - Mass is the amount of matter in an object and remains constant. - Weight is the force exerted by gravity on that mass and can vary depending on gravitational pull.

The human body is primarily composed of a few key elements that are vital for life and physiological processes.

Major Elements (96% of body mass):
1. Carbon (C)
2. Oxygen (O)
3. Hydrogen (H)
4. Nitrogen (N)

Chemical reactions are fundamental to metabolism and energy transfer in living organisms.

Catabolic Reactions: Decomposition reactions that break down molecules into smaller units. These are exergonic because they release energy.
Anabolic Reactions: Synthesis reactions that build larger molecules from smaller ones. These are endergonic because they absorb energy.

Maintaining a stable internal temperature is crucial for enzyme function and overall homeostasis.

Compounds in the body are classified based on the presence of carbon.

Organic Compounds: Contain carbon (e.g., carbohydrates, proteins, lipids, nucleic acids).
Inorganic Compounds: Generally do not contain carbon (e.g., water, salts).

Water is essential for life due to its unique chemical properties.

High Heat Capacity: Water can absorb or release large amounts of heat with little change in its own temperature, helping regulate body temperature.

Chemical bonds are broken and formed during metabolic reactions.

Hydrolysis: A reaction that uses water to break a chemical bond.
Cation: A positively charged ion (e.g., sodium).
Acidic Solutions: High concentration of hydrogen ions (H+).
Alkaline Solutions: Low concentration of hydrogen ions; a solution with pH of 8 is considered alkaline.
Blood pH: The body will not react if blood pH is 7.07, as this is near neutral.

Organic compounds are the building blocks of life and perform various functions in the body.

Major Organic Compounds:
1. Carbohydrates
2. Lipids (fats)
3. Proteins
4. Nucleic Acids
Synthesis: Organic compounds are synthesized via dehydration synthesis, where water is removed as building blocks are joined.

Carbohydrates are a primary source of energy for the body.

Main Monosaccharides:
1. Glucose
2. Fructose
3. Galactose
Lactose Breakdown: Lactose is broken down into glucose and galactose via hydrolysis.
Glycogen: Glycogen is the storage form of glucose, primarily stored in the liver.

Lipids serve as energy reserves and structural components of cell membranes.

Proteins are essential for structure, function, and regulation of the body's tissues and organs.

Building Blocks: Amino acids
Responsible Molecule for Protein Construction: RNA (Ribonucleic Acid)
Secondary Structures: Alpha-helix and beta-pleated sheet
Fibrous Proteins: Provide mechanical support and tensile strength; must remain stable in changing environments.
Globular Proteins: Function as enzymes.

Proteins can lose their function if their structure is altered, and phosphorylation is key for energy transfer.

Denaturation: Shape changes and disruption of active sites due to environmental changes.
Phosphorylation: The enzymatic transfer of phosphate groups to energize other molecules, essential for energy production.

Compound Type	Main Elements	Functions	Examples
Carbohydrates	C, H, O	Energy source, structure	Glucose, starch
Lipids	C, H, O	Energy storage, membrane structure	Triglycerides, phospholipids
Proteins	C, H, O, N, S	Structure, enzymes, transport	Hemoglobin, enzymes
Nucleic Acids	C, H, O, N, P	Genetic information, protein synthesis	DNA, RNA

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