| A | B |
|---|
| Arteries | Carry blood away from the heart |
| Heart rate change | Due to the body's oxygen needs |
| Ventricle contraction | Pumps blood out of the heart |
| Atria | Receives blood that comes into the heart |
| Cardiovascular System | Carry oxygen, carry waste away, and control body processes |
| Pulse rate increase | Due to the heart beating faster |
| Capillaries | Vessels where materials are exchanged between blood and body cells |
| Left ventricle | Heart chamber that contracts with the most force |
| Blood coming to atrium | Contains little oxygen and a lot of carbon dioxide |
| Right ventricle | Heart chamber that pumps oxygen-poor blood to the lungs |
| Respiration | Chemical process in which oxygen and glucose react to release energy |
| Respiratory system | Brings oxygen into the body |
| Exercise | Strengthens the heart muscle |
| Red blood cells | Carries oxygen in the blood to the body cells |
| Plasma | Component of the blood that is 90% water |
| Alveoli | Where gas exchange occurs in the respiratory system |
| Bronchi | Tubes in the respiratory system that resemble tree branches |
| Epiglottis | Small flap of tissue that seals off the trachea during swallowing |
| Pharynx | Part of the respiratory system and the digestive system |
| Nose | First place to clean, moisten, and warm air entering the body |
| Diaphragm | Moves upward to cause air to be exhaled from the lungs |
| Oxygen | Moves from the alveoli into the blood during gas exchange |
| Alveolus | Surrounded by a network of capillaries |
