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.
Rabbits and Hares. Of all the desert-dwelling mammals, the desert cottontail is probably the one you will see most frequently. Preyed upon by everything from snakes to coyotes to owls, most cottontails are killed within their first year.lthough the desert cottontail resembles most other cottontails, its ears are much larger. This grey rabbit with rufous nape and white tail weighs around 2 pounds (900 grams). It is the only cottontail in the Sonoran Desert.