1. HSA Practice Question
The kidneys regulate the levels of many chemicals and ions in the body. Which term best describes this process?
A. digestion
B. circulation
C. homeostasis
D. meiosis

2. Living things are organized!
Organizational structure of organisms:
Cellstissuesorgansorgan systemsorganisms
Not all organisms have all of these levels!
Unicellular organisms
Sponges
Etc., etc., etc.

3. Organ Systems
The following organ systems are critical to the normal functioning of the human body, as well as many other plants and animals!
Vascular system
Digestive system
Circulatory system
Excretory system
Skeletal system
Muscular system
Endocrine system
Reproductive systems
Nervous system / sensory organs

4. Vascular System
Many organisms have vascular systems for transporting materials from one location to another.
What substance has to get from the roots to the leaves and stem?
What substance needs to get from the leaves to the roots and stem?

5. Plant vascular system
Tissues called xylem and phloem get materials where they need to go in a plant.
Tubes for transporting materials are called vessels.

6. Animal Vascular System
The tubes that move materials around an animal like you are called blood vessels.
What substances must travel through your vascular system?

7. The Circulatory System
The circulatory system of animals includes:
Heart (most animals)
Blood vessels
Arteries
Veins
Capillaries
Blood
Its function is to move materials where they need to go, such as
Oxygen / CO2
Food
Waste

8. Circulatory System connections
The circulatory is a central body system since it gets materials produced by other systems where they need to go.

9. Respiratory System
The primary function of the respiratory system is to provide oxygen to all of your cells for aerobic respiration, and remove the CO2 waste produced.
The lungs are the key organ.

10. How Respiration Works in Your Lungs

11. Digestive System Breaks down food to provide nutrition to the body.
Major organs:
Stomach digests food
Intestines absorb nutrients
Liver, pancreas, and other organs regulate chemicals (i.e. glucose) in the blood

12. Excretory System Removes wastes and excess chemicals from the blood
Regulates water content
Kidneys are the key organs.

13. Skeletal System Provides support and structure to the body.
Works with the muscular system for movement.
Made of bones (in humans and many animals)

14. Muscular System Works with other body systems for movement.
Skeletal system for moving the body
Digestive system for moving food
Circulatory system for moving blood
Made of muscles (protein)

15. Endocrine System Controls many body functions.
Made of many glands that produce chemical hormones which can regulate
Metabolism
Growth & Development
Other body functions

16. Reproductive System Used for sexual reproduction
Makes haploid gametes
Supports embryo development
Angiosperm = flowering plant (sexual reproduction)

17. Nervous System Controls organ functions.
Senses the environment (sensory organs and nerves)
Processes information
Includes
Brain (many animals)
Sensory nerves & organs
Motor nerves (for movement)