Identify some of the early discoveries that lead to our current understanding of the human body

• Primitive people suffered from occasional aches and pains, injuries, bleeding, broken bones, and diseases.
• Before agriculture, infectious diseases did not spread easily because isolated bands of people had little contact with each other
• With agriculture, humans became susceptible to worm diseases because excrement was used in fertilizers and less reliance was placed on wild plants that offered their protective substances.
• Tooth decay was lowest among hunter-gathers and highest among city residents
• With urbanization, humans became more susceptible to infectious diseases and malnutrition

1. Subatomic Particles
2. Atom
3. Molecule
   
4. Macromolecule
5. Organelle
6. Cell
7. Tissue
8. Organ
   
9. Organ System
10. Organism
    

Parts of an atom

electrons, protons, neurons

Smallest part of an element

Hydrogen atom

Lithium atom

etc

Particle composed of two or more joined atoms

Water Molecule

Glucose Molecule

Very large molecule

Protein molecule

DNA molecule

A Structure or compartment in cells that houses the biochemical reactions that carry out specific function

Mitochondrion

Golgi apparatus

nucleus

The structural and functional unit in an organism

Muscle cell

Nerve cell

Assembled group of similar cells that perform a specialized function

Simple squamous epithelium

loose connective tissue

Structure consisting of twoor more tissues with a specialized function

skin

femur

heart

kidney

Organ system

Group of organs coordinated to carry on a specialized function

Skeletal system

digestive system

etc

an individual living thing

Human

Movement

Responsiveness

Growth

Reproduction

Respiration

Digestion

Absorption

Circulation

Assimilation

Excreation

Digestion