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.
Winter Diet of a Young Cottontail Rabbit. Cottontails do not hibernate, but their diet during the winter months is much less appealing. They will eat the woody parts of plants, including twigs and bark, as well as any small buds they can find.They have been known to eat birch, dogwood, maple, oak and sumac.s herbivores, the cottontail rabbits' diet consists solely of plants. What they eat depends on the season and what vegetation is readily available. During the summer they will each grasses, clover, herbs, fruits and vegetables, including those in your garden. As much as half of their diet may come from grasses.