Gas and nutrient exchange occur in the: veins. arterioles. arteries. capillaries.
Which vessels carry blood away from the heart? venules capillaries arteries veins
Leaky capillaries found in the bone marrow are called_________. arterioles fenestrated capillaries continuous capillaries sinusoidal capillaries
Which of the following is true about veins? Veins have valves; arteries do not. Veins carry blood away from the heart, while arteries carry blood to the heart. Veins are more muscular than arteries. Veins have a thinner lumen than arteries.
Veins have valves; arteries do not.
Which capillaries are the most common in the body? continuous capillaries anastomoses fenestrated capillaries sinusoids
Which of the following would not move by diffusion across a capillary into the surrounding tissue? Oxygen Proteins Lipid-soluble substances Carbon dioxide
Which of the following is NOT a capillary transport mechanism? movement through intracellular clefts or fenestrations diffusion through the membrane bulk flow transport via vesicles or caveolae
Which of the following will lower blood pressure? Atrial natriuretic peptide Antidiuretic hormone Aldosterone Angiotensin II
Atrial natriuretic peptide
Which of the following is NOT an important source of resistance to blood flow? vessel diameter total blood volume blood viscosity vessel length
total blood volume
Which of the following is involved in long-term blood pressure regulation? Renal mechanisms Chemoreceptor reflexes Baroreceptors Hormonal controls
Which of the following would experience a decreased blood flow during exercise? Kidneys Skeletal muscles Skin Brain
Which of the following is a long-term mechanism for maintaining blood pressure? baroceptor-initiated reflexes chemoreceptor-initiated reflexes renal regulation hormonal controls
Which of the following would be a result of anaphylaxis (a systemic allergic reaction)? Hypovolemic shock Cardiogenic shock Vascular shock Increased blood pressure
Lymph is most similar to: interstitial fluid. blood plasma. saliva. water.
Which of the following statements is true regarding veins versus lymphatic collecting vessels? Veins tend to form more branches (anastamoses) than do lymphatic vessels. Veins and lymphatic vessels have a different number of tunics. Veins have thinner walls than do lymphatic vessels. Veins have fewer internal valves than do lymphatic vessels.
Veins have fewer internal valves than do lymphatic vessels.
Once collected, lymph is returned to: the kidneys for filtration. arterial circulation. the liver for detoxification. venous circulation.
Which of the following are considered the primary immune system cells? lymphocytes plasma cells dendritic cells macrophages
Which of the following is a role of lymph nodes? They produce red blood cells. They produce lymph. They return lymph to circulation. They filter lymph.
They filter lymph.
The ________ is (are) the most likely to become infected. palatine tonsils pharyngeal tonsil tubal tonsil lingual tonsil
Peyer's patches are located: along the colon. along the small intestine. in the spleen. in the liver.