IndietroBasic Chemistry for Anatomy & Physiology: Chapter 2 Study Notes
Guida di studio - Note intelligenti
Appunti personalizzati basati sui tuoi materiali, ampliati con definizioni chiave, esempi e contesto.
Chemistry and Physiological Reactions
Introduction to Chemistry in Physiology
Chemistry is fundamental to understanding physiological processes in the human body. All living organisms are composed of chemicals, and chemical reactions underlie essential functions such as movement, digestion, heart function, and nervous system activity.
Basic Chemistry: Focuses on the foundational principles of matter and energy.
Biochemistry: Examines the chemical processes within and related to living organisms.
Matter and Energy
Properties of Matter
Matter is anything that has mass and occupies space. It can be observed directly or indirectly through its effects.
States of Matter:
Solid: Definite shape and volume.
Liquid: Changeable shape; definite volume.
Gas: Changeable shape and volume.
Mass vs. Weight: Mass is the amount of matter; weight is mass plus the effects of gravity.
Energy
Energy is the capacity to do work or put matter into motion. Unlike matter, energy does not have mass or occupy space.
Kinetic Energy: Energy in action.
Potential Energy: Stored (inactive) energy.
Transformation: Energy can be converted from potential to kinetic, such as stored energy being released to cause movement.
Forms of Energy
Chemical Energy: Stored in the bonds of chemical substances.
Electrical Energy: Results from movement of charged particles.
Mechanical Energy: Directly involved in moving matter.
Radiant/Electromagnetic Energy: Travels in waves (e.g., heat, visible light, ultraviolet light).
Energy Transformations
Energy Conversion: Energy may be converted from one form to another (e.g., chemical to mechanical).
Efficiency: Some energy is lost as heat during conversions, which can be partly unusable.
Atoms and Elements
Elements
Elements are pure substances that cannot be broken down by ordinary chemical means. They are the building blocks of matter.
Major Elements in the Body: Carbon, oxygen, hydrogen, and nitrogen make up 96% of body mass.
Lesser Elements: Make up 3.9% of body mass.
Trace Elements: Make up less than 0.01% of body mass.
Common Elements Composing the Human Body
Element | Atomic Symbol | Approx. % Body Mass | Functions |
|---|---|---|---|
Oxygen | O | 65.0 | Component of organic and inorganic molecules; needed for ATP production. |
Carbon | C | 18.5 | Component of all organic molecules (carbohydrates, lipids, proteins, nucleic acids). |
Hydrogen | H | 9.5 | Component of organic molecules; influences pH of body fluids. |
Nitrogen | N | 3.2 | Component of proteins and nucleic acids (genetic material). |
Atoms
Atoms are the smallest units of an element that retain the properties of that element. They consist of protons, neutrons, and electrons.
Protons: Positively charged particles found in the nucleus.
Neutrons: Neutral particles found in the nucleus.
Electrons: Negatively charged particles orbiting the nucleus.
Atoms are identified by their atomic number (number of protons) and mass number (protons + neutrons).
Isotopes
Isotopes are variants of elements with the same number of protons but different numbers of neutrons. Some isotopes are radioactive and can be used in medical diagnostics and treatments.
Additional info:
Understanding basic chemistry is essential for grasping physiological mechanisms in anatomy and physiology.
Energy transformations and the role of elements are foundational for cellular processes and overall body function.
