Peripheral Vasculature Quiz

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Questions and Answers

What is the primary function of arteries in the peripheral vasculature?

  • Transport deoxygenated blood to the heart
  • Facilitate nutrient exchange between blood and tissues
  • Help regulate blood pressure through vascular resistance
  • Carry oxygenated blood away from the heart (correct)

Which layer of blood vessels is responsible for minimizing friction and promoting transportation?

  • Tunica externa
  • Basement membrane
  • Tunica media
  • Endothelium (correct)

What is the role of sinusoids in the peripheral vasculature?

  • Carry oxygenated blood to various organs
  • Facilitate nutrient and oxygen exchange in muscles
  • Link arterioles and venules for blood return
  • Act as narrow vessels present in specific organs like the liver (correct)

Which component is crucial for the vascular response of vaso-constriction and dilation?

<p>Smooth muscle in the tunica media (B)</p> Signup and view all the answers

How do collateral circulation systems maintain blood supply during limb movement?

<p>By creating alternative pathways for blood flow when main vessels are compressed (D)</p> Signup and view all the answers

What is the primary function of the tunica adventitia in blood vessels?

<p>Protects, strengthens, and anchors the vessel (B)</p> Signup and view all the answers

Which type of artery is characterized by a large amount of elastin and a thick tunica media?

<p>Elastic artery (D)</p> Signup and view all the answers

What distinguishes veins from arteries?

<p>Veins are more collapsible under pressure (A)</p> Signup and view all the answers

What function do fenestrations and pores in blood vessels serve?

<p>They allow for rapid exchange of substances. (C)</p> Signup and view all the answers

What is the main role of the musculo-venous pump in venous circulation?

<p>To compress veins and assist blood return to the heart. (A)</p> Signup and view all the answers

Which of the following accurately describes capillaries?

<p>Have a single layer of endothelial cells (B)</p> Signup and view all the answers

What role do pericytes play in the structure of capillaries?

<p>They wrap around capillaries and can contract (A)</p> Signup and view all the answers

How does the dense venous fascia in the legs assist in circulation?

<p>By preventing backflow of blood. (A)</p> Signup and view all the answers

What is a key feature of arterioles compared to larger arteries?

<p>Have a narrower lumen to resist blood flow (A)</p> Signup and view all the answers

What type of blood does the pulmonary trunk carry?

<p>Deoxygenated blood from the right ventricle. (A)</p> Signup and view all the answers

Which structure in veins helps prevent the collapse of the vessel?

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

What occurs when blood flows through the lungs?

<p>It picks up oxygen and releases carbon dioxide. (D)</p> Signup and view all the answers

Which of the following characteristics differentiates elastic arteries from muscular arteries?

<p>Elastic arteries are typically larger and more elastic (D)</p> Signup and view all the answers

What is the primary function of valves in the veins?

<p>To ensure one-way blood flow and prevent backflow. (B)</p> Signup and view all the answers

Which structure is part of systemic circulation?

<p>Aorta. (C)</p> Signup and view all the answers

What happens during sluggish blood flow in the microcirculation?

<p>It provides sufficient time for diffusion across the endothelial layer. (C)</p> Signup and view all the answers

What is the primary function of arteries in the circulatory system?

<p>To deliver oxygenated blood from the heart to the body (B)</p> Signup and view all the answers

Which structure is responsible for preventing backflow of blood into the left atrium?

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

What is the pathway of deoxygenated blood returning to the heart from the body?

<p>Superior vena cava → Right atrium → Right ventricle (A)</p> Signup and view all the answers

Which of the following structures is part of the pulmonary circulation?

<p>Pulmonary arteries (D)</p> Signup and view all the answers

What is the correct sequence of blood flow from the right atrium?

<p>Right atrium → Tricuspid valve → Right ventricle (A)</p> Signup and view all the answers

Identify the major vessel that distributes oxygenated blood to the body from the left ventricle.

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

What role do veins have in the circulatory system?

<p>To return deoxygenated blood to the heart (C)</p> Signup and view all the answers

Which chamber of the heart receives blood from the pulmonary veins?

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

What does the femoral artery become after passing through the adductor hiatus?

<p>Popliteal artery (D)</p> Signup and view all the answers

Which artery branches from the popliteal artery and supplies the anterior compartment of the leg?

<p>Anterior tibial artery (D)</p> Signup and view all the answers

Which artery serves as a major source of blood supply to the posterior compartment of the leg?

<p>Fibular artery (C)</p> Signup and view all the answers

What is the main function of the genicular arteries?

<p>Provide blood to the knee joint (C)</p> Signup and view all the answers

Which artery directly continues from the popliteal artery to the sole of the foot?

<p>Posterior tibial artery (D)</p> Signup and view all the answers

Which of the following is NOT a branch of the common iliac artery?

<p>Internal carotid artery (C)</p> Signup and view all the answers

What is the role of the tarsal tunnel in relation to the arteries?

<p>Passage for the posterior tibial artery to the foot (A)</p> Signup and view all the answers

Which artery is primarily responsible for supplying the femoral head?

<p>Medial circumflex femoral artery (C)</p> Signup and view all the answers

Which artery branches off into the radial and ulnar arteries?

<p>Brachial artery (D)</p> Signup and view all the answers

What is the role of collateral vessels?

<p>To provide alternate routes for blood flow around joints (A)</p> Signup and view all the answers

Which vein has the same name as the accompanying artery?

<p>Radial vein (C)</p> Signup and view all the answers

Where are deep veins located in relation to the arteries?

<p>In the muscular compartments (A)</p> Signup and view all the answers

Which artery supplies blood to the forearm and hand?

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

What is the difference between superficial and deep veins?

<p>Superficial veins are located near the surface; deep veins are within muscles. (B)</p> Signup and view all the answers

Which arteries form the palmar arches?

<p>Radial artery and ulnar artery (C)</p> Signup and view all the answers

Which arteries branch off the subclavian artery in the upper limb?

<p>Brachial and axillary arteries (A)</p> Signup and view all the answers

What branches off the aorta to supply the pelvis and lower limbs?

<p>Common iliac arteries (D)</p> Signup and view all the answers

Which of the following arteries is responsible for supplying the arm?

<p>Brachial artery (D)</p> Signup and view all the answers

Flashcards

Arteries

Carry oxygenated blood away from the heart.

Veins

Carry blood back to the heart.

Capillaries

Tiny vessels linking arterioles and venules, enabling exchange of oxygen and nutrients between blood and tissues.

Sinusoids

Narrow vessels found in the liver, spleen, and bone marrow.

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Tunica Intima

The innermost layer of a blood vessel, composed of endothelium and a basement membrane.

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Tunica Adventitia

The outermost layer of a blood vessel, providing protection, strength, and anchoring it to surrounding tissues. It also contains vasa vasorum, which are tiny blood vessels supplying the larger vessel itself.

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Vasa Vasorum

Tiny blood vessels that supply the larger blood vessels with oxygen and nutrients, especially useful for the thicker walls of arteries.

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Elastic/Conducting Arteries

Arteries that have a thick layer of elastic fibers, making them able to expand and recoil with each heartbeat, allowing for smooth blood flow.

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Muscular/Distributing Arteries

Arteries with a thick layer of smooth muscle, allowing them to constrict and dilate, regulating blood flow to different organs based on demand.

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Arterioles/Resistance Arteries

The smallest arteries that offer significant resistance to blood flow, playing a crucial role in regulating blood pressure and directing blood to different organs.

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Pericytes

Contractile cells that wrap around capillaries, contributing to their regulation and ability to adjust blood flow.

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Pulmonary Circulation

The flow of blood from the heart through the lungs and back to the heart.

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Pulmonary Trunk

It carries deoxygenated blood from the right ventricle to the lungs.

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Aorta

It carries oxygenated blood from the left ventricle to all parts of the body.

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Systemic Circulation

The flow of blood from the heart throughout the body and back to the heart.

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Musculo-venous Pump

This mechanism helps push blood upward against gravity, promoting its flow back to the heart. It involves deep veins in the legs contracting and valves preventing backflow.

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Blood Circulation

The process of blood flowing through the body's circulatory system, including the heart, arteries, veins, and capillaries.

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Vein Valves

They play a vital role in blood circulation by preventing backflow of blood in veins, ensuring efficient blood return to the heart.

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Circulation

The flow of blood from the heart through the body back to the heart, transporting oxygen and nutrients while removing waste products.

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Superior vena cava

One of the two large veins that return deoxygenated blood from the upper body to the heart's right atrium.

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Inferior vena cava

One of the two large veins that return deoxygenated blood from the lower body to the heart's right atrium.

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Tricuspid valve

The valve that separates the right atrium from the right ventricle, allowing blood flow in one direction.

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Pulmonary artery

The large artery that carries deoxygenated blood from the right ventricle to the lungs to be oxygenated.

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Pulmonary valve

The valve separating the right ventricle from the pulmonary artery, ensuring proper blood flow.

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Mitral valve

The valve that separates the left atrium from the left ventricle, allowing blood flow in one direction.

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Subclavian Artery

The major artery that supplies the upper limb and originates from the aortic arch.

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Axillary Artery

The subclavian artery continues into the axillary artery as it passes through the axilla (armpit).

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Brachial Artery

The axillary artery becomes the brachial artery as it runs down the arm.

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Radial Artery

A branch from the brachial artery that supplies the radial side of the forearm.

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Ulnar Artery

A branch from the brachial artery that supplies the ulnar side of the forearm.

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Internal Jugular Vein

A large vein that drains blood from the brain, head, and neck and empties into the superior vena cava.

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Brachiocephalic Vein

The large vein formed by the union of the internal jugular vein and the subclavian vein.

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Palmar Arches

A network of veins that drain blood from the hand and forearm.

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Axillary Vein

The major vein that drains blood from the upper limb, continuing into the subclavian vein.

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Brachial Vein

The major vein that drains blood from the arm, continuing into the axillary vein.

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What is the Aorta?

The main artery that carries oxygenated blood from the left ventricle of the heart to the rest of the body.

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What are the main branches of the common iliac artery?

The external iliac artery supplies blood to the lower limb, while the internal iliac artery supplies blood to the pelvic organs.

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What is the main artery in the thigh?

The femoral artery is the main artery of the thigh, supplying blood to the leg and foot.

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What is the main artery behind the knee?

The popliteal artery is a continuation of the femoral artery behind the knee, supplying blood to the lower leg and foot.

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What are the main arteries in the lower leg?

The anterior tibial artery supplies blood to the front of the lower leg and foot, while the posterior tibial artery supplies blood to the back of the lower leg and foot.

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What is the main artery on the top of the foot?

The dorsalis pedis artery is a continuation of the anterior tibial artery in the foot, supplying blood to the top of the foot.

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Which artery supplies the fibula?

The fibular branch is a branch of the posterior tibial artery supplying blood to the fibula bone (the smaller, outer bone of the lower leg).

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What is the tarsal tunnel?

The tarsal tunnel is a space behind the medial malleolus (ankle bone) where the posterior tibial artery passes through.

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Study Notes

Peripheral Vasculature - Lecture Objectives

  • This lecture aims to classify blood vessels, identify major vessels, describe the upper and lower limb vasculature, explain arterial and collateral circulation, and examine venous return from the periphery.

Classification of Blood Vessels

  • Arteries: Carry oxygenated blood away from the heart.
  • Veins: Return deoxygenated blood to the heart.
  • Capillaries: Tiny vessels that facilitate oxygen and nutrient exchange between blood and tissues.
  • Sinusoids: Specialized capillaries, found in liver, spleen, and bone marrow.

Basic Structure of Blood Vessels

  • Tunica Intima: Innermost layer, composed of endothelial cells and thin basement membrane. Minimizes friction and aids in transport, osmosis and vasoactive functions.
  • Tunica Media: Middle layer comprised of smooth muscle cells and elastic fibers. This layer supports the vessels and allows for vasoconstriction and vasodilation.
  • Tunica Adventitia: Outermost layer, composed of elastic and collagen fibers, providing support and protection while anchoring the vessels to surrounding tissues. It also contains Vasa Vasorum, or small vessels for nourishing the vessel wall itself

Types of Arteries

  • Elastic/Conducting Arteries: Large, thick walls with significant elastic tissue, like the aorta, facilitating the smooth flow of blood. They can withstand high pressures.
  • Muscular/Distributing Arteries: Medium-sized arteries with thicker walls, have more muscle layers, including the renal artery, brachial artery, femoral artery. Crucial for distributing blood to specific organs.
  • Arterioles: Smallest branches of arteries, major role in regulating blood flow into capillaries via vasoconstriction and vasodilation.

Veins

  • Structure: Wider lumen (cavity) and thinner walls compared to arteries. Valves prevent backflow, especially in lower limbs. Have a thick tunica adventitia, enabling resistance to lower pressures.
  • Function: Return deoxygenated blood to the heart.

Capillaries

  • Structure: Single layer of endothelial cells, facilitating efficient substance exchange. Contain pores and fenestrations for rapid diffusion. Pericytes regulate blood flow.
  • Function: Enables gases (oxygen and carbon dioxide), nutrients, and wastes to exchange across. Regulate blood flow.

Musculo-Venous Pump

  • Muscle contractions squeeze veins, aiding blood return to the heart—venous valves prevent backflow.

Systemic and Pulmonary Circulation

  • Systemic Circulation: Carries oxygen-rich blood from the left ventricle to the body via aorta to tissues, which return deoxygenated blood to the right atrium.
  • Pulmonary Circulation: Transports deoxygenated blood from the right ventricle to the lungs via pulmonary trunk. Collects the oxygenated blood from the lungs via pulmonary veins and returns it to the left atrium. Gas exchange takes place in lungs (O2 picked up, CO2 released).

Great Vessels and Arteries

  • Aorta: Major artery branching from the heart.
  • Common Carotid Arteries: The main arteries carrying blood to the head and neck originating from the aortic arch.
  • Brachiocephalic Artery: Branches off the aortic arch supplying blood to the right arm and part of the head. A large artery that branches off the aortic arch.
  • Subclavian Arteries: Branches supplying blood to the upper limbs.
  • Left and Right Common Iliac Arteries: Branches off the aorta branching to supply blood to the pelvis and lower limbs.
  • Other major arteries: Various arteries supplying other regions and smaller limbs.

Great Vessels and Veins

  • Superficial and Deep Veins: Superficial veins located in the superficial fascia; deep veins within the muscular compartments (matching artery nomenclature).
  • Major veins: Various veins returning blood to the heart, matching the artery names.

Key Areas for Identification (Image-Based)

  • The document includes several images for identifying specific structures (A-E, pulses, and various vessels) This section will only be helpful with the supporting diagram

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