The circulatory system consists of the heart, blood vessels, and blood. The heart pumps oxygen-rich blood through arteries and oxygen-poor blood returns through veins. Blood is made up of plasma and blood cells like red blood cells, white blood cells, and platelets. The lymphatic system collects fluids from tissues and returns it to the blood. The respiratory system includes the nose, larynx, trachea, lungs, and bronchi. Gas exchange occurs through diffusion between alveoli and capillaries in the lungs. Breathing is driven by the diaphragm contracting during inhalation and relaxing during exhalation.

1. CHAPTER 37: Circulatory and Respiratory Systems Alana and Haley

2. What is the Circulatory System? It consists of: The Heart Blood Vessels Blood It transports blood throughout the body. heart Blood vessels blood Alana and Haley

3. Heart and Blood Pressure Systemic Circulation Pulmonary Circulation Heart pumps blood through the body using contractions Heart is about the size of your fist Alana and Haley

4. Blood Vessels Usually, oxygen rich blood through arteries Usually, oxygen poor blood Through veins Alana and Haley

5. Blood Plasma Made of 90% water 10% dissolved gasses Contains salts, nutrients, enzymes, hormones, waste products, and plasma proteins. Alana and Haley

6. Blood Cells Red blood cells transport oxygen White blood cells fight infection Platelets help with blood clotting Alana and Haley

7. The Lymphatic System A network of vessels that collect fluids lost by the blood Then, it returns it to the Circulatory system Alana and Haley

8. What is the Respiratory System? Consists of nose, larynx, trachea, lungs, bronchi, and alveoli Alana and Haley

9. Gas Exchange Occurs by diffusion across membrane of an alveolus and capillary Blue=oxygen Green=carbon dioxide Alana and Haley

10. Breathing When you inhale, diaphragm contracts When you exhale, diaphragm relaxes Alana and Haley