3. How many broods do Brown-headed nuthatches have each year? 3. How many broods

Question

3. How many broods do Brown-headed nuthatches have each year? 3. How many broods do Brown-headed nuthatches have each year? 3. How many broods do Brown-headed nuthatches have each year? Pig outline with major organs/structures of the . respiratory and circulatory systems drawn in and labeled -> the following questions: re is the pharynx? What structures are 2. List the major vessels attached to the left and 3. Where is the aorta? Where does it lead from and 4. There are four sets of valves in the heart. Name 5. Describe the pathway of a drop of blood starting 6. List two major differences between bird lungs connected to it? right atrium, and left and right ventricles. to? them, and describe their location in the right atrium and ending in the left foot. and the mammalian lungs 4 MacBook Pro

Explanation / Answer

4. Right AV Valve, Left AV Valve, Pulmonary Semilunar Valve Aortic Semilunar Valve.

5. Blood flows from the right atrium into the right ventricle through the right AV valve. After the ventricle fills with blood it contracts and then the AV valve closes preventing backflow into the atrium. With backflow prevented, the blood is forced to move onward through the pulmonary semilunar valve and into the pulmonary artery. The pulmonary artery carries blood deoxygenated blood to the lungs. In the lung smaller blood vessels recombine to form a large pulmonary vein that returns the blood to the left atrium. This is the only vein in the body that transports oxygenated blood. The left atrium collects blood from lungs. It is thin walled and small as compared to a ventricle. After filling, the atrium contracts forcing blood through the open left AV valve and into the left ventricle. The left AV valve, prevents backflow of blood when the ventricle contracts. The left venticle is the largest and most muscular heart chamber. When it contracts blood is forced under very high pressure out through the aortic semilunar valve and into the aorta. This blood vessel, the largest of all of the arteries, branches into a network of smaller arteries that transport blood to all parts of the body.

6. The lungs of birds do not expand or contract.

Mammals Lung do expand or contract.

In birds, the exchange happens in air capillaries which are walls of microscopic tubules.

Because birds do not have alveoli.

In mammals, the oxygen and carbon dioxide is exchanged in the alveoli which are microscopic sacs in the lungs.

There are two respiratory cycles in birds.

There is only a single respiratory cycle in mammals.

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