Astudent makes the analogy that the cardiovascular system is like a highway. why is this a good analogy? a. blood is made of many different kinds of cells. b. the heart pumps blood through the veins. c. the heart is centralized in the body. d. blood transports materials to and from different parts of the body.

The right answer is D.

Blood is a vital biological fluid that circulates continuously in the blood vessels and heart, especially through the heart pump. It is composed of an aqueous fluid, plasma, and billions of cells, mainly red blood cells, which give it its color.

This fluid transports oxygen (O2) and nutrients necessary for the vital processes of all tissues of the body, as well as wastes, such as carbon dioxide (CO2) or nitrogenous waste, to the evacuation sites (kidneys), lungs, liver, intestines). It also allows the cells and molecules of the immune system to be transported to the tissues, and to spread hormones throughout the body.

Blood transports materials to and from different parts of the body

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure