Topic 4: Multicellular Organisms

Cells Basic building block of life What happens when we put cells together?

Tissues Groups of similar cells that function together Animals – 4 types Connective Supports and connects different parts of the body Blood, cartilage, bones

2. Epithelial Covers the surface of organs and body 3. Nervous Sends signals throughout your body 4. Muscle Enables movement

Plants 1. Photosynthetic Sugar is produced & stored 2. Protective 3. Transport Xylem Water Phloem Food

Organ Groups of tissues that work together to do a specific function Groups of organs that work together to do a certain function Organ Systems

1. Respiratory system Key function Exchange gases Oxygen from air to blood Carbon dioxide from blood to air

Break down food into smaller pieces 2. Digestive system Key functions Break down food into smaller pieces Absorb nutrients

Transport substances throughout the body 3. Circulatory system Key functions Transport substances throughout the body Defend the body Connect all organ systems

Remove wastes from the blood 4. Excretory system Key functions Remove wastes from the blood Expel wastes from the body

5. Nervous system Key functions Send signals in reaction to stimuli

Organ systems REACT and INTERACT They react to changes in the outside world They rely on each other for survival