WK 3: Tissues and Organs

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What is the minimum number of different tissue types present in an organ?

One

Four

Two (correct)

Three

What is the main function of capillaries in the body?

To facilitate gas and nutrient exchange (correct)

To regulate blood pressure

To return blood to the heart

To convey blood away from the heart

Which of the following tissue types is NOT one of the four basic tissue types?

Cardiac (correct)

Epithelial

Muscle

Nervous

What is the direction of blood flow in veins?

From the body tissues to the heart Signup and view all the answers

How do arteries change as they branch out?

They become progressively smaller Signup and view all the answers

What is the purpose of studying the organisation and function of the four major types of tissues in blood vessels?

To appreciate the structure and function of blood vessels Signup and view all the answers

What is the main function of metarterioles?

To function as sphincters for capillary beds Signup and view all the answers

What is the main component of the tunica intima in capillaries?

Endothelial cells and basal lamina Signup and view all the answers

What type of tissue surrounds capillaries and venules?

Pericytes Signup and view all the answers

What is the main function of capillaries?

To allow gas and nutrient exchange between the blood and the body tissues Signup and view all the answers

What is the characteristic of the tunica adventitia in arterioles?

Scant, loose fibroelastic connective tissue Signup and view all the answers

What is the direction of blood flow in systemic veins?

From the body tissues to the heart Signup and view all the answers

What is the main function of the Tunica Externa in blood vessels?

To anchor the vessel to other tissues Signup and view all the answers

What type of arteries have more elastic fibers and less smooth muscle?

Elastic arteries Signup and view all the answers

What is the characteristic of the endothelium in the Tunica Intima of elastic arteries?

Axes parallel to the longitudinal axis of the vessel Signup and view all the answers

What is the purpose of the Vasa Vasorum in blood vessels?

To supply oxygenated blood to the vessel wall Signup and view all the answers

What happens to the walls of veins when they are not filled with blood?

They collapse Signup and view all the answers

What is the characteristic of arteries in the systemic circulation?

They carry oxygenated blood to the body tissues Signup and view all the answers

What is the main function of the endothelium in blood vessels?

To provide a smooth surface for the passage of blood Signup and view all the answers

Which of the following layers is composed of loose connective tissue?

Subendothelium Signup and view all the answers

What is the main function of the tunica media?

To regulate blood pressure through vasoconstriction Signup and view all the answers

What is the composition of the basement membrane?

Basal lamina, lamina lucida, lamina densa, and lamina reticularis Signup and view all the answers

Which of the following is NOT a component of the tunica externa?

Smooth muscle cells Signup and view all the answers

What is the function of the internal elastic lamina?

To separate the tunica intima from the tunica media Signup and view all the answers

What is the primary function of smooth muscle cells in Tunica Media?

To regulate blood flow through vasoconstriction and dilation Signup and view all the answers

Which layer of an arteriole has the least amount of smooth muscle cells?

Tunica Intima Signup and view all the answers

What is unique about the Tunica Adventitia of muscular arteries?

It has a relatively thin layer of fibroelastic tissue Signup and view all the answers

What is the significance of the number of lamellae in the Tunica Media?

It increases with age Signup and view all the answers

What is the function of metarterioles?

To control blood flow to capillary beds Signup and view all the answers

What is a unique feature of small arterioles?

They are limited to endothelium and a layer of smooth muscle fibers Signup and view all the answers