What is capillary?

Answer 1

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.

Answer 2

Capillaries are the smallest branches of the blood vessel system in any warmblooded animal. (The same name, "capillary," is also used for the smallest branches of any system of tubes that bring fluid from one large reservoir to multiple smaller destinations.)

The capillaries join the arterioles (the next smallest branches of the blood vessel system), which bring blood from the heart to the tissues of the body, and the venules (the next larger branches of the blood vessel system), which carry the blood back to the heart from the various tissues of the body. It is in the capillaries that oxygen, nutrients, proteins, and fluid are exchanged from the blood to the tissue cells and carbon dioxide, toxins, metabolites, and other waste materials are brought from the tissue cells to the blood, where they are then carried ultimately either to the lungs (where carbon dioxide is exhaled), the liver (where toxins are broken down and excreted into the bowel), or the kidneys (where waste products are excreted into the urine).