The Science of Anatomy and Physiology Anatomy the

The Science of Anatomy and Physiology

Anatomy • the study of internal and external structures and the physical relationship between body parts • Greek – a cutting open Physiology • the study of how living things perform their vital functions These two subjects are interrelated because “structure determines function”

Anatomy can be categorized based on the degree of structural detail under consideration: Microscopic anatomy: • considers structures that can NOT be seen without magnification • the boundaries are established by the limits of the equipment used (BAT) Macroscopic anatomy: • considers the structures that can be seen without magnification • aka gross anatomy

Which is which? • Classify each as either anatomy or physiology – mass of a liver – The cross section of a brain – The pumping of blood through an artery – The size of a female tarsal bone – The exchanging of oxygen in the lungs – How a muscle contracts

Review… • Anatomy or Physiology? – Stomach acids digesting food – The gray matter of the brain – Pigmentation of the skin – Blinking of the eyes • Macroscopic or microscopic – – Diseased lung Bones Hair root bulb Sense receptors on the tongue

Levels of organization: There are 6 different levels, each increasing in complexity

Chemical or Molecular Level • atoms combine to form molecules [i. e. proteins, DNA, enzymes, etc. . ] with complex shapes • the shape of the molecules determines its function

Cellular Level • different molecules interact to form organelles • each types of organelle has a specific function • organelles perform vital functions that keep the cell alive • cells represent this level

Tissue Level tissue is composed of similar cells working together to perform a specific function

Organ Level organs consist of two or more different tissues that work together to perform a specific function

Organ System Level when different organs work together to perform a specific function

Organism Level all of the organ systems of the body working together to maintain life and health

Each level of organization depends on the others, and damage at the cellular, tissue, or organ level can affect the entire system Because all parts of a system are interdependent, damage to one component will ultimately affect the system as a whole

Your summary of Levels of Organization • For your summary please make a flow chart molecules to organism – Off of each level give examples

Bell Ringer… 1. What level(s) of organization would be considered microscopic anatomy? Gross anatomy? 2. Give an example for each level of organization

Bell Ringer… • Anatomy or Physiology? – Stomach acids digesting food – The gray matter of the brain – Pigmentation of the skin – Blinking of the eyes • Macroscopic or microscopic – – Diseased lung Bones Hair root bulb Sense receptors on the tongue

Bell Ringer… Tell if anatomy of physiology… – Measuring an organ’s size, shape, and weight – Chemistry principles – Measuring the acid content of the stomach – Observing a heart in action – Dynamic – Dissections – Experimentation – Observation – Can be studied in dead specimens – Often studied in living things – Principle of physics – static

Necessary Life Functions… • All highly complex living things must: – Maintain boundaries – Move – Respond to environmental changes – Carry out metabolism • Take in and digest nutrients – Dispose of wastes – Grow – Reproduce themselves

Requirements of Organisms… • Human life depends upon the following environmental factors: – Water – Food – Oxygen – Heat – pressure

Water… • The most abundant substance in the body (60 – 80% of our body weight) • It is required for a variety of metabolic processes, and it provides the environment in which most of them take place • Transports substances within the organisms • Important in regulating body temperature

Food (nutrients)… • Any substance that provides organisms with necessary chemicals (nutrients) in addition to water • Supply energy and raw materials for building new living matter

Oxygen… • A gas that makes up about one-fifth of the air • It is used in the process of releasing energy from nutrients • The released energy is used to drive metabolic processes

Heat… • A form of energy that is present in our environment • If varies in either direction, can cause problems • It can be a product of metabolic reactions and it partly controls the rate at which these reactions occur – In general – the more heat, the more rapid the reactions will take place • Remember: temperature is a measure of the amount of heat present

Pressure… • Is the application of forces on an object or substance • It plays an important role in breathing • It also plays an important role in hydrostatic pressure (the pressure exerted by a liquid) – Blood pressure – which keeps blood flowing through blood vessels

Which is which? • Includes carbohydrates, proteins, fats, and minerals • Essential for normal operation of the respiratory system and breathing • Single substance accounting for over 60% of body weight • Required for the release of energy from foodstuffs • Provides the basis for body fluids of all types • When too high or too low, physiological activities cease, primarily because molecules are destroyed or become nonfunctional