Capillaries are where fluids, gasses, nutrients, and wastes are exchanged between the blood and body tissues by diffusion. Capillary walls contain small pores that allow certain substances to pass into and out of the blood vessel.apillaries measure in size from about 5-10 microns in diameter. Capillary walls are thin and are composed of endothelium (a type of simple squamous epithelial tissue). Oxygen, carbon dioxide, nutrients and wastes are exchanged through the thin walls of the capillaries.
Quick Answer. Cottontail rabbits are herbivorous animals that will eat nearly any plant or vegetable that they can get. They do not prefer any type of plant compared to others; but they will tend to eat more of certain things, such as grass or bark, depending on the season that it is. Continue Reading.
Learning How to Feed Your Rabbit. 1  1. Feed your rabbit unlimited grass hay. With hay being such an important component of your rabbitâs diet, it makes sense that he should have plenty of it on a daily basis. 2  2. Limit the amount of pellets in your rabbitâs diet. With pellets, your rabbit can have too much of a good thing. Limit your rabbitâs daily pellet intake to 1/8 to 1/4 cup per five pounds of body weight. Divide the total daily allotment in half: feed one-half in the morning and the other half in the evening.