Circulatory system and blood cells

1.     Which row is correct for the pulmonary artery?

• Carries deoxygenated blood, thick muscle in walls and small lumen size

• Carries deoxygenated blood, thin muscle in walls and large lumen size

• Carries oxygenated blood, thick muscle in walls and small lumen size

• Carries oxygenated blood, thin muscle in walls and large lumen size

• In a closed circulatory system, blood is pumped around the body and is always contained within a network of _____________ _______________

The __________ side of the heart pumps deoxygenated blood to the lungs

Type of circulation that refers to blood flow from the heart to the lungs and back to the heart again?

• Systemic circulation

• Renal circulation

• Portal circulation

• Pulmonary circulation

The type of blood vessel where exchange of gases, nutrients, and wastes occurs?

• Arteries

• Capillaries

• Veins

As blood flows from an artery to a vein, the thickness of the walls of the vessels changes.Which bar chart shows these changes correctly? Art: Artery, A: Arteriole, C: Capillary, V: Venule, Vn: Vein

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The photomicrograph shows a section through a structure found in mammals viewed using a light microscope. What are the main components of layer W?

• Collagen fibres only

• Elastic fibres and collagen fibres

• Smooth muscles and elastic fibres

• Squamous epithelial cells forming an endothelium

The large arteries close to the heart have a thick elastic layer in their walls.

Which statements about this layer are correct?

1 helps to maintain the blood pressure in arteries

2 reduces friction within the arteries

3 prevents too much pressure bursting the artery wall

• 1, 2 and 3

• 1 and 3 only

• 1 only

• 2 and 3 only

What is the blood pressure in the capillaries?

• 120mmHg

• 60mmHg

• 35mmHg

• 5mmHg

What is the advantage of having thin capillary wall (one cell thick)?

• Large surface area for diffusion

• Red blood cells are squeezed into the capillary one by one to ensure that they lies flat and near the cells

• Short distance for diffusion for efficient gas exchange

• Can go between cells