Answer:
D) four.
Explanation:
The two atria hold the blood that circulates away from the heart. The heart has four one-way valves, which open and close with each heartbeat. The tricuspid valve and the mitral valve are located between the atria and allow the blood to flow from the atria to the ventricles. Also you don't have to but mind marking Brainliest?
Answer:
Aerobic Fitness or Cardiorespiratory Endurance - the ability to deliver oxygen and nutrients to tissues, and to remove wastes, over sustained periods of time.
Any activity you do from taking a walk to washing the dishes it requires oxygen.
Regular aerobic fitness exercise increases your body's ability to use oxygen. How well you use oxygen is termed your "aerobic capacity." When your aerobic capacity is high, your heart, lungs and blood vessels efficiently transport and deliver large amounts of oxygen throughout your body. Aerobic exercise helps you in your daily activities.
Explanation:
in other words they are related
hope i helped
Answer:true
Explanation:
You can throw it away after use