Heart
what does the heart do in the circulatory system
A four-chambered muscular pump that moves blood
Do arteries have valves like veins?
No
What is the primary function of capillaries?
To facilitate the exchange of water, oxygen, carbon dioxide, and nutrients.
What is the liquid part of the blood called, and what does it contain?
Plasma is the liquid component, but it also contains proteins, nutrients, hormones, and waste products.e
What is the main function of veins?
Veins carry deoxygenated, waste-rich blood back to the heart.
Which chamber is the strongest/thickest?
The left ventricle
Do all arteries carry oxygenated blood?
No
How are capillary walls structured for their function?
They have extremely thin walls consisting of only a single layer of endothelial cells (tunica intima).
What is the average volume of blood in an adult human body?
An adult human typically has about 5 liters of blood.
Why do leg veins have valves?
Valves prevent blood from flowing backward due to gravity as it travels up toward the heart.
What is the natural pacemaker of the heart?
The SA (sinoatrial) node
Why are artery walls thick and elastic?
To withstand and accommodate the high-pressure blood flow produced by the heart's contractions.
What are the three main types of capillaries?
Continuous, Fenestrated, and Sinusoid.
Which component of blood is responsible for clotting?
Platelets, along with clotting factors like fibrinogen
What causes varicose veins?
Weakened vein walls and damaged valves cause blood to pool, usually due to age, genetics, pregnancy, long periods of sitting/standing.
The left ventricle, as it pumps blood throughout the entire body.
The epicardium.
What is the main function of arteries?
To carry oxygen-rich blood away from the heart to the rest of the body
What is the function of precapillary sphincters?
They are rings of smooth muscle that regulate blood flow into true capillary beds.
What is the most common type of white blood cell?
Neutrophils.
How can you prevent varicose veins?
Maintain a healthy weight, exercise regularly, elevate your legs, and avoid standing or sitting for too long.
What is the valve between the right atrium and right ventricle?
The tricuspid valve.
Where are arteries located in the body, typically?
Deep under the skin
Which blood vessels do capillaries connect?
Capillaries bridge the gap between the smallest arteries (arterioles) and the smallest veins (venules).
What is the primary function of hemoglobin in red blood cells?
Hemoglobin is a protein that binds to oxygen in the lungs and transports it to tissues throughout the body, while also carrying carbon dioxide waste back to the lungs.
What are common symptoms of vein disease?
Symptoms include leg pain, itching, swelling, cramping, burning, and skin discoloration.