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Circulatory System Overview

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Questions and Answers

What is the primary function of platelets in the body?

To carry oxygen to tissues
To produce antibodies
To prevent blood loss and infection (correct)
To transport carbon dioxide

How does the structure of red blood cells contribute to their function?

They have a nucleus to regulate cell function.
They have a biconcave shape to increase surface area. (correct)
They contain white pigment to absorb light.
They are large to accommodate more hemoglobin.

What distinguishes arteries from veins in terms of structure?

Veins operate under high blood pressure like arteries.
Arteries have a thick muscular wall, while veins have a thinner wall. (correct)
Arteries contain valves while veins do not.
Arteries have a larger lumen compared to veins.

What role do white blood cells play in the circulatory system?

<p>They help defend the body against infection and disease. (D)</p> Signup and view all the answers

Which component is NOT part of the circulatory system?

<p>Lungs (B)</p> Signup and view all the answers

Flashcards

Platelets

Cell fragments in blood responsible for clotting, preventing blood loss and infection after injury.

White Blood Cells

White blood cells are part of the immune system that fight off infections and diseases.

Red Blood Cells

Red blood cells are responsible for carrying oxygen throughout the body.

Artery

Arteries are blood vessels that carry oxygenated blood away from the heart to the body.

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Vein

Veins are blood vessels that carry deoxygenated blood back to the heart from the body.

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Study Notes

Blood Components

Platelets are cell fragments that are crucial for blood clotting, preventing blood loss and infection after a cut.
White blood cells fight infection and disease in the body.
Red blood cells carry oxygen.
Red blood cells are biconcave, increasing surface area for oxygen absorption.
Red blood cells contain hemoglobin, binding to oxygen.
Red blood cells lack a nucleus to maximize oxygen-carrying capacity.

Blood Vessels

Arteries have a small lumen (the inside space).
Veins have a large lumen.
Arteries need high blood pressure to carry blood.
Arteries have thick, muscular walls for strength.
Veins lack the thick muscular walls of arteries.
Veins contain valves to prevent blood backflow.