MICROANATOMY

Detailed explanation-1: -The thin membranous skin is allows the respiratory gases to readily diffuse directly down their gradients between the blood vessels and the surroundings. When the frog is out of the water, mucus glands in the skin keep the frog moist, which helps absorb dissolved oxygen from the air.

Detailed explanation-2: -The skin of frogs is also always moist because it is covered by a layer of mucus which causes the respiratory gases to dissolve and diffuse easily. Under the layers of skin is a dense network of blood capillaries to increase the diffusion rate of gases between the skin and the blood capillaries.

Detailed explanation-3: -Most amphibians breathe through lungs and their skin. Their skin has to stay wet in order for them to absorb oxygen so they secrete mucous to keep their skin moist (If they get too dry, they cannot breathe and will die).

Detailed explanation-4: -Adaptations of the alveoli: Moist walls-gases dissolve in the moisture helping them to pass across the gas exchange surface. Permeable walls-allow gases to pass through. Extensive blood supply-ensuring oxygen rich blood is taken away from the lungs and carbon dioxide rich blood is taken to the lungs.

Detailed explanation-5: -They are cold blooded, which means that their body temperatures change with that of the environment. A frog has lungs for breathing but also breathes through its skin. They have webbed feet, which help them to swim. More items