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I need help with biology plzzzzz?

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Which of the following actions increases the volume of your lungs, allowing more gases to be exchanged?  
 A. The diaphragm flattens and moves downward.  
B. The rib cage becomes smaller.  
C. Air pressure increases inside the lungs.  
D. Gases move from areas of lower pressure.  
2. The blood in veins is  
 A. leaving the lungs.  
B. moving in single file.  
C. carrying oxygen.  
D. traveling to the heart.  
3. Blood is carried to and from the cells of the body by the  
 A. arteries.  
B. capillaries.  
C. muscles.  
D. veins.  
4. Oxygen inhaled into the alveoli diffuses into the  
 A. capillaries.  
B. arteries.  
C. adjacent alveoli.  
D. bronchioles.  
5. The nervous system regulates breathing and the exchange of gases in the lungs by  
 A. overriding signals during exercise.  
B. monitoring dissolved gases in the blood.  
C. maintaining a constant rate of inhalation.  
D. constricting the blood vessels in the lungs.  
6. How does asthma affect the exchange of gases in the lungs?  
 A. It causes the bronchioles to constrict reducing the amount of gases allowed into or out of the lungs.  
B. It destroys alveoli over time reducing the amount of surface area for gases to be exchanged.  
C. It makes the lungs produce mucus blocking the surface area for gases to be exchanged.  
D. It relaxes the diaphragm too much reducing the amount of gases allowed into or out of the lungs.  
7. Why does CO2 diffuse from the blood into the alveoli?  
 A. CO2 concentration is higher in the blood than in the alveoli.  
B. The brain signals the alveoli to absorb CO2 .  
C. When O2 leaves the blood, another gas must replace it.  
D. There is not enough hemoglobin to carry the CO2.  
8. Where does the first contraction of the heartbeat take place?  
 A. In the ventricles  
B. In the atria  
C. In the valves  
D. In the septum  
9. The AV node signals the heart's ventricles to contract, pumping oxygen-poor blood from the right ventricle into the  
 A. aorta.  
B. pulmonary vein.  
C. pulmonary artery.  
D. atria.  
10. Which parts of the circulatory system delivers oxygen-rich blood to the rest of the body?  
 A. The left ventrical and the pulmonary vein  
B. The left atrium and the capillaries  
C. The atria and the pulmonary artery  
D. The left ventrical and the aorta  
11. Which of these structures of the lymphatic system helps to develop lymphocytes?  
 A. The tonsils  
B. The thymus  
C. The lymph nodes  
D. The lymph vessels  
12. How do lymphocytes help the body?  
 A. They produce clotting factors.  
B. They filter and clean the lymph.  
C. They destroy foreign organisms.  
D. They reduce swelling in the nodes.  
13. Lymph nodes filter lymph and trap:  
 A. Fungi  
B. Viruses  
C. Bacteria  
D. All of the above  
14. Circulation is maintained in the veins by the  
 A. activity of skeletal muscles.  
B. use of two-way valves.  
C. contraction of elastic fibers.  
D. prevention of clotting.  
15. Materials can diffuse into and out of blood in the capillaries because the capillary  
 A. beds are near the heart.  
B. fibers are very elastic.  
C. walls are very thin.  
D. muscles act as pumps.  
16. The diastolic pressure occurs when the  
 A. left ventricle relaxes.  
B. right ventricle contracts.  
C. blood rushes into an artery.  
D. systolic pressure is too high.  
17. Permanently high blood pressure is called  
 A. stroke.  
B. atherosclerosis.  
C. hypertension.  
D. arteriosclerosis.  
18. A clear, pale-yellow fluid that makes up more than half of the blood is known as  
 A. plasma.  
B. platelets.  
C. white blood cells.  
D. red blood cells.  
19. The part of blood that carries oxygen and carbon dioxide to the rest of the body is the  
 A. plasma.  
B. platelets.  
C. white blood cell.  
D. red blood cell.  
20. If you do not have the Rh protein marker on your red blood cells, you would be said to be?  
 A. Rh negative  
B. Rh positive  
C. Type O  
D. Type AB  
21. If you have neither the A nor the B protein marker in your blood, your blood is likely to be Type  
 A. A.  
B. B.  
C. AB.  
D. O.  
22. To help seal a wound, platelets release proteins called  
 A. surface protein markers.  
B. Rh factors.  
C. immune proteins.  
D. clotting factors.  
23. The major function of the lymphatic system is to  
 A. transport blood from nodes to organs.  
B. conduct messages from sensors to the brain.  
C. return fluid to the capillaries.  
D. collect excess fluid from between the cells.  
24. How are veins and lymph vessels similar?  
 A. Both rely on one-way valves to avoid backflow.  
B. Both use a pump to keep up pressure.  
C. Both have elastic fibers to move fluid.  
D. Both leak fluid from their capillaries.  
25. The lymphatic system empties lymph back into the circulatory system  
 A. by way of valves.  
B. at lymph nodes.
asked Mar 30, 2012 by carbonfiber (405 points)