Name: 5. Blood Vessels 1. The walls of the large blood vessels are composed ofth

Question

Name: 5. Blood Vessels 1. The walls of the large blood vessels are composed ofthree layers: 2, The of arteries and veins is under the control of the autonomic nervous system and is involved in both vasoconstriction and of blood vessels. 3. Arteries carry blood from the to the All arteries carry oxygenated blood except the trunk and its branches. All veins 4. Veins return blood from the to the carry deoxygenated blood except the 5. Which types of capillaries would you find in each of these organs? Liver: Skeletal muscle: Choroid plexus: Kidney: 6. What is the function of capillaries? 7. When blood makes a circuit through a portal system, it travels through capillary beds. 8. In a fetus, when blood passes through the ductus venosus, it bypasses the which is not yet 9. Two structures associated with the heart of a fetus that allow blood to bypass the pulmonary circulation are 10. Under normal conditions, blood pressure in an artery oscillates from a low of mm of mm of Hg called the Hg called the pressure to a maximum of pressure.

Explanation / Answer

1.

The walls of the large blood vessels composed of three layers that are:-

A. Three layers

1. Tunica intera

            a. Inner most layer

            b. Endothelium

                        i. Simple squamous

            c. Some larger vessels have subendothelium

                        i. Loose connective tissue

                        ii. Basement membrane

2. Tunica media

            a. Middle layer

            b. Circularly arranged smooth muscle

            c. Chemical and nervous control of degree of contraction

                        i. Sympathetic NS

            d. Change in diameter

                        i. Vasoconstriction

                        ii. Vasodilation

3. Tunica externa

            a. Made of collagen fibers

            b. Function

                        i. Protection

                        ii. Reinforcement

                        iii. Anchor to surrounding tissue

            c. Accessory tissues

                        i. Nerve fibers

                        ii. Lymphatic vessels

                        iii. Elastic network

                        iv. Tiny blood vessels within layer-vasa vasorum

2.

3.

Arteries carry blood from the heart to the various body parts. All arteries carry oxygenated blood except pulmonary trunk(artery)and its branches.

4.

Veins return blood from the various body parts to the heart. All veins carry deoxygenated blood except the pulmonary veins.

5.

which types of capillaries would you found in these organs:-

1. Liver - Sinusoids

2. Skeletal muscle - continous capillaries

3.choroid plexus -fenestrated capillaries

4. Kidney - Peritubular capillaries

6.

Functions of capillaries:-

1. The function of capillaries is enabling the exchange between water, oxygen, carbon dioxide, nutrients and many other substances between blood and the surrounding tissues.

2. The capillaries connect the arterioles and venules to create uninterrupted blood flow through the body.

3. Capillaries are selectively permeable, their permeability is what allows them to carry out their job, and how permeable they are varies depending on the organ or tissue they are found in.

7.

8.

bypasses the Liver .which is not yet knownand has so far only been estimated approximately.

9.

Two structures associated with the heart of fetal that allow blood to bypass the pulmonary circulation are

foramen ovale and ductus arteriosus.

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