The Circulatory System Quiz

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Questions and Answers

What is the primary function of the circulatory system?

  • To produce hormones
  • To transport substances throughout the body (correct)
  • To facilitate breathing
  • To protect against infections

Blood is a type of epithelial tissue.

False (B)

What type of tissue lines the blood vessels and the heart?

epithelial tissue

The heart is a large __________.

<p>muscle</p> Signup and view all the answers

Which blood component is responsible for transporting oxygen?

<p>Red blood cells (C)</p> Signup and view all the answers

Match the following components of blood with their functions:

<p>Red blood cells = Transport oxygen White blood cells = Fight infections Platelets = Aid in clotting Plasma = Transport nutrients</p> Signup and view all the answers

Platelets make up __________ of your blood volume.

<p>less than 1%</p> Signup and view all the answers

The heart has nerve tissue connected to it that stimulates contraction.

<p>True (A)</p> Signup and view all the answers

Name one waste product that blood transports out of the body.

<p>carbon dioxide</p> Signup and view all the answers

What percentage of your blood is made up of white blood cells?

<p>1% (B)</p> Signup and view all the answers

Flashcards

What is the function of the circulatory system?

The circulatory system is responsible for transporting vital substances throughout the body, connecting all organs and tissues.

What are the main components of the circulatory system?

It consists of the heart, blood, and blood vessels, working together as a coordinated unit to transport essential substances throughout the body.

What types of tissues are present in the circulatory system?

The circulatory system comprises all four types of tissues, including connective tissue in blood and heart valves, epithelial tissue lining vessels and the heart, muscle tissue in the heart, and nerve tissue controlling heart contractions.

What is the most abundant type of blood cell?

Red blood cells, also known as erythrocytes, are the most abundant type of blood cell, constituting approximately 45% of the blood volume.

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What is hemoglobin and what is its role?

Hemoglobin is a protein found within red blood cells, responsible for binding and transporting oxygen and carbon dioxide. It has four sites where these gases can attach.

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What is the function of red blood cells in gas exchange?

Red blood cells play a crucial role in transporting oxygen from the lungs to the body's tissues and carrying carbon dioxide from tissues back to the lungs for exhalation.

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What are white blood cells and what is their function?

White blood cells, also called leukocytes, account for about 1% of the blood volume and are responsible for fighting infections.

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What are macrophages and what is their role?

Macrophages are a type of white blood cell that engulf and destroy infectious agents, acting as phagocytes.

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What are lymphocytes and what do they do?

Lymphocytes are another type of white blood cell that produce antibodies, specialized proteins that bind to and neutralize infections.

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What are platelets and what is their role?

Platelets are small, cell-like fragments in blood that help with blood clotting. They form a plug at the site of injury, preventing excessive bleeding.

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Study Notes

The Circulatory System

  • The circulatory system is the organ system responsible for transporting substances throughout the body.
  • The circulatory system comprises blood, the heart, and blood vessels.
  • The circulatory system contains four types of tissue: connective, epithelial, cardiac muscle, and nerve tissue.
  • Blood vessels include arteries, veins, and capillaries.
  • Arteries carry blood away from the heart under high pressure.
  • The walls of arteries are thick and muscular to withstand this pressure.
  • Veins carry blood toward the heart.
  • Capillaries are small blood vessels with very thin walls allowing for material exchange. Blood cells pass through one cell at a time.
  • Blood is a connective tissue that circulates throughout the body.
  • Blood transports oxygen, nutrients, heat energy, carbon dioxide, hormones, and waste.
  • Blood is made up of:
    • Red blood cells (45% of blood): contain hemoglobin with 4 sites for oxygen and carbon dioxide attachment. Oxygen is transported from the lungs to tissues, and carbon dioxide is transported from tissues to the lungs.
    • White blood cells (1% of blood): include macrophages that can "eat" infections, and lymphocytes that produce antibodies that can attach to and destroy infections.
    • Platelets (<1% of blood): Essential for blood clotting.
    • Plasma (55% of blood): the liquid portion of blood, rich in protein, controls blood volume and blood pressure and carries dissolved minerals, nutrients, and wastes.
  • The heart contains cardiac muscle tissue, nerve tissue, and connective tissue.
  • The heart is divided into four chambers: right and left atria, right and left ventricles.
  • Blood flows from the body, to the heart, to the lungs, and back to the body.
  • The heart pumps blood throughout the body in a continuous cycle.

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