Body Structure & Function/Common Health Problems

Hemoglobin is the correct answer because it is a substance found in red blood cells that carries oxygen and gives blood its color. Hemoglobin binds to oxygen in the lungs and releases it to the body's tissues, ensuring the delivery of oxygen throughout the body. It also gives blood its red color. Hormone, H2O, CO2, and platelets are not substances that carry oxygen or give blood its color.

A vein is a blood vessel that carries deoxygenated blood back to the heart. Unlike arteries, veins have thinner walls and contain valves to prevent blood from flowing backward. The deoxygenated blood from various parts of the body is collected by veins and transported back to the heart, where it will be pumped to the lungs for oxygenation. Veins are an essential part of the circulatory system and play a crucial role in maintaining blood flow and oxygenation throughout the body.

An artery is a blood vessel that carries blood away from the heart. It is responsible for delivering oxygen-rich blood to various parts of the body. Arteries have thick, elastic walls that help withstand the high pressure generated by the heart's pumping action. The blood flowing through arteries is typically bright red in color, indicating its oxygenation. Unlike veins, which carry blood back to the heart, arteries carry oxygenated blood from the heart to nourish tissues and organs throughout the body.

Groups of tissues with the same function form an organ. An organ is a structure made up of different types of tissues that work together to perform a specific function in the body. It is a higher level of organization than tissues and is essential for the proper functioning of the body.

Organs that work together to perform special functions are called systems. The term "systems" refers to a group of organs that work together to carry out specific functions in the body. These systems include the digestive system, respiratory system, circulatory system, nervous system, and many others. Each system is made up of multiple organs that collaborate to perform a particular task, ensuring the overall functioning and well-being of the body.

A capillary is a tiny blood vessel that connects arteries and veins. It is responsible for the exchange of oxygen, nutrients, and waste products between the blood and surrounding tissues. Capillaries have thin walls, allowing for efficient diffusion of substances. They are essential for the proper functioning of various organs and tissues in the body.