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Capillaries
The smallest vessels in the circulatory system that are located within the tissues of the body, they transfer blood from the arteries, through the tissues to drop of nutrients and pick up waste and back to the veins.
1,213 Questions
What network of specialized capillaries within the brain secretes cerebrele spinal fluid?
choracoid plexus
Why would you expect gills to have an exceptionally large number of capillaries?
Capillaries, which are the smallest of the blood vessels, are the site of gas exchange...carbon dioxide diffuses out of surrounding cells into the gills to be lost into the environment, and oxygen diffuses from the environment into the gill cells and then surrounding tissues. The gills function like the lungs of a fish, so large numbers of capillaries in these structures function to supply oxygen/get rid of waste carbon dioxide for the organism.
Why does capillary change color as it passes by your body cells?
Capillaries change color as they pass by body cells as the blood they contain loses oxygen. Oxygen-rich blood has a brighter color than oxygen-poor blood.
It helps in exchange of materials and gases between the blood and other surrounding cells easily.
If you dreamt that you were floating above your sleeping body and that your body's eyes opened and walked out of the room, then you have good things in store for you.
How is the distribution of blood in the various capillary pathways regulated?
The distribution of blood in the capillaries is regulated by the smooth muscles contracting or relaxing. This occurs due to the needs of the cells supplied by the capillary.
What are the four Layers of alveolar capillary membrane?
→ layers from alveolus to capillary
①surfactant layer (inside alveolus)
②pneumocyteⅠ(typeⅠ cell) layer
③fused basal lamina (consists of basal laminae of alveolar epithelium and capillary endothelium)
④endothelium (inside capillary)
easy efficient exchange between air and blood
What happens to the velocity of the blood flowing as it goes from the aorta to the capillaries?
Arteries have the highest blood pressure out of the three because arteries carry oxygen rich cells which then loses some of its pressure as it goes further away from the heart.
Where blood pressure is lowest would be from the capillaries to the veins because after all the rich oxygenated cells are taken out of the cell and replaced with waste and CO2, the blood pressure becomes much lower. (Also because it is further away from the heart.
dermis
What factor will increase the net filtration pressure to move fluid out of the capillaries?
Increased blood hydrostatic pressure.
The structure of a capillary wall differs from that of vein or artery because?
it has a single tunic- only the tunica interna
1. Study the diagram of a chicken wing. Use the diagram to help you locate certain muscular and
skeletal structures.
2. Thorough washing of hands, countertop and instruments have to be done at the
end to prevent salmonella contamination.
3. Your teacher will give you a chicken wing. Rinse it well with cool water, dry it with paper towels, and
place it in a dissecting tray.
4. Examine the wing at the point where it was removed from the body. Depending on the way the wing
is cut, you might see cartilage and bone marrow.
5. Carefully extend the wing to find out how many major parts it has.
6. Using the scissors, cut down the middle of the skin, starting at the top end of the upper wing. Try not
to cut through the muscles below the skin. Do this by piercing the skin and then slipping the scissors
between the skin layer and the muscle. Cut until you reach the shoulder joint. (See figure 1, Cut 1.)
Only cut through the skin. CAUTION: Cut away from your body and your classmates.
7. Cut down the sides of the skin to make a T-shaped cut. Start at the first cut and cut away from it in
both directions. Peel the skin and cut to loosen it. (Note: the chicken skin can be very difficult to remove.
Take your time peeling it back so as not to damage the tissues underlying it.) (See Figure 2, Cut 2.)
8. Look for yellowish tissue clumped together beneath the skin. This is fat tissue, made of fat cells.
9. Examine the muscles, the bundles of pink tissue around the bones. Find the two groups of muscles in
the upper arm. Hold the arm down at the shoulder, and alternately pull on each muscle group. Observe
what happens on each muscle group. Observe what happens.
Show teacher that you did this. Teacher initials: _____________10. Find the two groups of muscles in the lower arm. Hold down the arm at the elbow, and alternately
pull on each muscle group.
11. Find the tendons--shiny white tissue at the ends of the muscles. Notice what parts the tendons
connect.
Show teacher that you did this. Teacher initials: _____________
12. Remove the muscles and tendons. Find the ligaments, the whitish ribbon like structures between
bones.
Show teacher that you did this. Teacher initials: _____________
CLEAN UP
Dispose the chicken parts according to your teacher's instructions. Wash your
hands with soap and water. Thoroughly wash the lab countertop with 409.
Thoroughly wash the scissors with hot soapy water. Set instruments on a clean
paper towel to dry.
Post Lab activities
1. Color all of the muscles in the wing RED.
2. Color all of the tendons in GREY.
3. Color the locations where you would find ligaments in GREEN.
4. Color the bones YELLOW.
4. Label (with an arrow) the direction the radius and ulna move when the triceps contract.
5. Circle the three joints shown in the diagram.
6. Label the ball and socket joint, hinge joint, and peace.
How does the application of ice to the ankle aff ect blood fl ow through the capillaries?
Applying ice to your ankle decreases the blood flow through nearby capillaries. This occurs because the capillaries constrict to conserve heat.
Arteries carry blood to the tissues, and veins carry blood back to the heart. In betweenare tiny blood vessels so small that red blood cells can pass through single file, allowingthe oxygen to diffuse into the surrounding tissue. These are called capillaries.
