1) Why do birds preen their feathers?
2) What is the function of air sacs?
3) What is an advantage of a four-chambered heart?
PLEASE answer as much as you can! First gets BA.
2) What is the function of air sacs?
3) What is an advantage of a four-chambered heart?
PLEASE answer as much as you can! First gets BA.
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1) Birds often preen—running their beaks through their feathers or scratching their heads with a toe. Some birds have a special comb-like structure on one toe for this purpose. Preening helps to maintain birds’ feathers and skin in several ways. Birds often preen after they’ve been dust bathing or diving, or when the weather is wet, times when feathers need grooming.
2) The function of air sacs in birds is to permit one-way ventilation of the lungs.
3) You actully want oxygen depleted blood to go to the lungs and you want oxygen rich blood to go back out to the body. Won't work the way you have it.
The main advantage is efficiency of the pumping mechanism thru distribution of the work.
More chambers ensure that not one muscle area is doing all the work. Some areas rest while other work.....ease of use.
2) The function of air sacs in birds is to permit one-way ventilation of the lungs.
3) You actully want oxygen depleted blood to go to the lungs and you want oxygen rich blood to go back out to the body. Won't work the way you have it.
The main advantage is efficiency of the pumping mechanism thru distribution of the work.
More chambers ensure that not one muscle area is doing all the work. Some areas rest while other work.....ease of use.