Circulatory systems contain all of the following except (not all circularity systems contain all of these)? O Valves O Respiratory pigments O Circulatory fluid Pump(s)
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- The human circulatory system isclosed—that is, the blood pumped out of the left ventricle of the heartinto the arteries is constrained to a series of continuous, branching vesselsas it passes through the capillaries and then into the veins as it returnsto the heart. The blood in each of the heart’s four chambers comesbriefly to rest before it is ejected by contraction of the heart muscle. The velocity of blood in the aorta can be measured directly with ultrasound techniques. A typical graph of blood velocity versus time during a single heartbeat is shown in Fig. . Which statement is the best interpretation of this graph? (a) The blood flow changes direction at about 0.25 s; (b) the speed of the blood flow begins to decrease at about 0.10 s; (c) the acceleration of the blood is greatest in magnitude at about 0.25 s; (d) the acceleration of the blood is greatest in magnitude at about 0.10 s.How does the flow of a fluid in a closed circulatory system differ fromthe movement of molecules between cells and their environment withregard to distance traveled, direction traveled, and driving force?In this image of a blood vessel, which layer(s) are an elastic lamina? А В C E O A only O E only O D only O A, C and E only O B & D only
- Why, even thoough theyhave an open circulatorysystem, can flying insects likeflies beat their wings withgreat speed?large amount of blood intoyour heart, wlo the dolood. passing throuah heart can quiclly run dut of axya en stop beating baislemoin the LAD your +Congestive heart failure (CHF) is an inability of the heart to pump sufficient blood to the body. One sign of CHF is excess fluid in the tissue spaces, known as edema. Describe the location of the edema if the left side of the heart fails, compared to the 16. location of edema if the right side of the heart fails. toCardiac myocytes are mechanically connected via O Gap junctions O Autorhythmic cells O Purkinje fibers O Desmosomes O Tight junctions
- Vhen dissecting a specimen, Carl Justin noticed that the arteries were thicker and more elastic than the veins. Why? O Arteries are under greater pressure, O Veins return blood to the heart against gravity. O Arteries have less smooth muscle than veins., O Veins have valves. O Arteries contain a greater volume of blood.What are the advantages ofthe closed circulatory systemover the open circulatorysystem?The ________ layer secretes chemicals that help to regulate ionic environments and strength of contraction and serve as powerful vasoconstrictors. pericardial sac endocardium myocardium epicardium
- Visit this site (http://openstaxcollege.org/l/heartvalve) to observe an echocardiogram of actual heart valves opening and closing. Although much of the heart has been removed from this gif loop so the chordae tendineae are not visible, why is their presence more critical for the atrioventricular valves (tricuspid and mitral) than the semilunar (aortic and pulmonary) valves?Figure 40.10 Which of the following statements about the circulatory system is false? Blood in the pulmonary vein is deoxygenated. Blood in the inferior vena cava is deoxygenated. Blood in the pulmonary artery is deoxygenated. Blood in the aorta is oxygenated.Three-chambered hearts with incomplete septa wereonce viewed as being less adapted to circulatory functionthan mammalian hearts. What advantage of such heartsdid this viewpoint overlook?