Destroyer Bio 68

[dentalplan]

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The question asks:

which of the followingis incorrectly matched?

a) fish : 2 chambered heart
b) frog : 3 chambered heart
c) artery : No valves
d) pulmonary vein : oxygenated blood
e) ascending loop of henle : permeable to water

The answer they give is E, and I agree, however, isn't C also incorrectly matched?

Because, doesn't the aorta, or some other big artery have something called the semi lunar valve to prevent backflow from the artery to the ventricle? I read this on wikipedia, plus from the diagram's I saw in campbell's, schaum's, and gray's, the semi lunar valve looks like its directly attached to a big artery. Or at least associated with it somehow. So can anyone help me out here?

 

[dentalplan]

anyone?

 

[tsav23]

No arteries do not have valves. Veins have valves, but not arteries. When blood flows from the left ventricle to through the aortic valve, it then becomes the aorta, and arteries branch off from the aorta to various parts of the body, then go through the arterioles, to capillaries for skeletal diffusion of oxygen, and then through the venuoles, to the veins, which have valves to prevent lack of blood to the heart.

Hopefully that helps.

 

[War Eagle]

I see what you're saying, but I think they may classify the semilunar valves as being part of the heart and not the artery. Not sure, but in any of my classes in which we talked about the heart we usually talk about its 4 valves. Besides that, however, there are no valves in arteries. For arteries in which blood moves against gravity, blood pressure is enough to move it, and gravity helps with the others. Veins below the heart must have valves to aid in the return of blood.

Just checked my anatomy book and my physiology book, and both state that the semilunar valves are between the ventricles and the arteries.

 

[osimsDDS]

yea you are right it is a valve that is very important in the artery leading to the aorta, but yea i believe they classify that as a "heart valve" like the tricuspid valve of the right atrium and ventricle and the mitral valve of the left atrium and ventricle. But yea valid point, and unless you are a cardiologist I dont think there is any way you would be able to know the difference haha