science test 2/6/26

heart

A hollow, muscular organ that pumps blood throughout the body.

arteries

Blood vessels that carry oxygenated blood away from the heart

capillaries

small delicate blood vessels that penetrate body tissues, allowing oxygen, nutrients, and waste products to be exchanged between tissues and the blood.

viens

blood vessels that collect deoxygenated blood and return it to the heart

blood

a vital fluid that circulates through the body, primarily responsible for transporting oxygen, nutrients, hormones, and immune cells to tissues while removing waste products like carbon dioxide

Red Blood Cells (RBC)

responsible for transporting oxygen from the lungs to body tissues and carrying carbon dioxide waste back to the lungs to be exhaled

White Blood Cells (WBC)

the body's primary defense against infection, disease, and foreign invaders like bacteria, viruses, and fungi

platelets

primarily function to stop bleeding (hemostasis) by adhering to damaged blood vessels, activating, and aggregating to form a plug

cells

generating energy from nutrients, transporting materials, synthesizing proteins, removing waste, repairing tissue damage, and replicating to enable growth

tissue

provide structural support, protection, movement, communication, and metabolic regulation throughout the bod

organ

specialized structures composed of different tissues that work together to perform specific, essential life functions, such as pumping blood, filtering waste, and breathing

qualities a organ needs to be called an organ

It must be composed of two or more different types of tissues working together. must have a specific, distinct function or set of functions within the body.

qualities a tissue needs to be called an tissue

a group of similar cells working together to perform a specific, common function.

qualities a cell needs to be called an cell

three main parts: the cell membrane, the nucleus, and the cytoplasm