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.
Wild rabbits eat grass, which is, in its dry form, simply hay. In addition to the invaluable fiber it contains, hay also provides vitamins, minerals, and protein in a form the rabbit's digestive tract can handle. Young rabbits, less than six months of age, can be fed alfalfa hay rather than timothy hay. Alfalfa hay is higher in protein and calcium and lower in fiber than timothy hay. This is acceptable, even desirable, in young, rapidly developing rabbits. But alfalfa hay is unhealthy for adult rabbits. Rabbits between the ages of seven months and a year should be transitioned to timothy hay. Rabbits will prefer alfalfa hay, so during the transition you may need to mix the two types of hay. In some cases, a rabbit may rebel and not eat the timothy hay.