Circulatory System Flashcards
(13 cards)
Which organs does the circulatory system include?
Heart, blood vessels, and blood
The heart is enclosed in a protective sac of tissue called the…
Pericardium
The _______ divides the left side of the heart from the right side of the heart
Septum
How many chambers does a human heart have?
4
The upper chambers are called the _____, and the bottom chambers are called the _________
Atria; ventricles
The heart functions as two separate pumps. The right side of the heart pumps blood from the heart to the lungs and is called the _______ circulation pathway
Pulmonary
Oxygen-rich blood from the lungs flows into the left side of the heart and is pumped to the rest of the body. This is called the _______ circulation pathway
Systemic
Blood that returns to the right side of the heart is oxygen-poor because _______________________________________. The cycle starts again when this blood goes to the lungs.
it has delivered oxygen to the body’s tissues and picked up carbon dioxide as waste
Why are valves important to the heart?
Valves keep blood flowing in one direction and prevent it from flowing backward
What are the three types of blood vessels in the circulatory system?
- Arteries
- Capillaries
- Veins
Artery
Carries blood away from the heart
Capillaries
Allow exchange of gases, nutrients, and wastes
Veins
Carry blood back to the heart
