1. BELL RINGER [3 Minutes] Mark K/S/H/D for Body Systems Vocabulary Write 1 sentence using an AWL Vocabulary Word (Differentiate, Impact, Evaluate, Criteria)

2. BELL RINGER [3 Minutes] Body Systems Matching

3. MYP Biology: Human Body Systems

4. Different cells work together in increasing levels of organization within the human body There are more than 200 different types of cells in the human body

5. Early cells of the human embryo are called Stem Cells. They have the unique ability to become any type of human body cell through a process called Differentiation. Different cells work together in increasing levels of organization within the human body

6. Groups of similar cells work together to form tissues. There are four types: Different cells work together in increasing levels of organization within the human body

7. Epithelial tissue is made up protective sheets of tightly-packed cells. Examples include the skin, and membranes lining the stomach and lungs

8. Connective tissue supports and joins together other organs and tissues. Examples include tendons (muscle-bone joint), ligaments (bone-bone joint), bone, and cartilage.

9. Muscle tissue can contract (pull back) to produce movement

10. Nervous tissue sends and receives impulses (electrical signals) in response to stimuli (something in the surrounding environment)

11. Different types of tissues working together make up units called organs. Two or more organs functioning together make up an organ system. Different cells work together in increasing levels of organization within the human body

12. Major organ systems allow the human body to maintain homeostasis:

13. The Nervous System Major Function: Processes information and controls the body’s response to its environment. Organ / TissueFunction Brain Controls the function of all other organs through generating muscle responses and secreting hormones Spinal cord & peripheral nerves Transmits nerve signals from the brain to the rest of the body.

14. How does it help maintain homeostasis? Signals from electrical impulses and hormones control the interrelated functions of all organ systems. Controls response to the environment / senses

15. The Respiratory System Major Function: Brings oxygen (O 2 )into the body and releases carbon dioxide (CO 2 ) Organ / TissueFunction Nose Takes in and releases air Trachea Windpipe; allows passage of air to lungs Lungs Transfers oxygen from inhaled air to the bloodstream; exhales carbon dioxide

16. How does it help maintain homeostasis? Regulates stable oxygen and carbon dioxide levels in blood Low oxygen and high carbon dioxide levels can both cause damage

17. The Circulatory System Major Function: Circulates oxygen, nutrients, and wastes through the body through bloodstream. Organ / TissueFunction HeartPumps blood through circulatory system ArteriesVessels that carry blood AWAY from the heart VeinsVessels that carry blood TO the heart CapillariesTiny vessels joining veins and arteries

18. How does it help maintain homeostasis? Ensures all cells have a stable level of oxygen, glucose, and other nutrients to keep them alive and functioning Heart rate is consistent

19. The Digestive System Major Function: Breaks-down and absorbs nutrients, water, and salts from food Organ / TissueFunction Mouth Takes in and begins digestion of food EsophagusAllows passage of food from mouth to stomach Stomach Digests food with acids and enzymes

20. The Digestive System Organ / TissueFunction Small / Large Intestine Absorbs nutrients and water from digested food and transfers to blood Pancreas Produces digestive enzymes and hormones that regulate digestion Liver Produces bile and hormones that help with digestion; detoxifies blood

21. How does it help maintain homeostasis? Ensures cells have access to the nutrients they need to function Also digests / removes toxins from the blood

22. The Immune System Major Function: Protects the body from pathogens (things that can make us sick, ex: bacteria, viruses) Organ / TissueFunction Skin Barrier and first line of defense against pathogens Thymus Develops white blood cells Spleen Produces antibodies (which target and mark pathogens for destruction)

23. How does it help maintain homeostasis? Protects the body from infection, which disrupts homeostasis in different organ systems

24. The Excretory System Major Function: Filters and removes wastes from the body Organ / TissueFunction Kidneys Filters waste and excess products of metabolism out of the blood Bladder Collects and releases urine filtered from the kidneys Large Intestine Reabsorbs water from waste to make solid feces

25. How does it help maintain homeostasis? Removes solid and liquid waste from body Returns extra water and nutrients back to the bloodstream

26. Examples of Human Homeostasis: Thermoregulation Brain regulates responses in skin, muscles, and blood vessels to maintain stable internal body temperature 98.6°F in humans Shivering / sweating

27. Examples of Human Homeostasis: Blood-Glucose Level Pancreas and liver produce hormones that maintain a constant level of glucose in the bloodstream Diabetes occurs when these hormones are unable to properly regulate blood sugar levels

28. Examples of Human Homeostasis: Heart Rate / Breathing Rate Constant resting heart rate (60-75 BPM) allows consistent blood supply to major organs / cells Heart rate / breathing increases during exercise to provide more oxygen and nutrients to cells to process more energy