What is blood? Blood, by definition, is a fluid that moves through the vessels of a circulatory system. In humans, it includes plasma (the liquid portion), blood cells (which come in both red and white …

Here, we’ll take a closer look at the different components of the plasma membrane, examining their roles, their diversity, and how they work together to make a flexible, sensitive, and secure boundary …

They help regulate blood flow in the brain, maintain the composition of the fluid that surrounds neurons, and regulate communication between neurons at the synapse.

The kidney is key to blood pressure control. Angiotensin and aldosterone play major roles. To understand their action, you have to understand the structure and function of the kidney.

The innate immune system is essentially made up of barriers that aim to keep viruses, bacteria, parasites, and other foreign particles out of your body or limit their ability to spread and move …

When the cells lining a blood vessel are damaged, they display a protein receptor called tissue factor. When tissue factor binds to a molecule present in the extracellular matrix, it triggers a range of …

Bugs have exoskeletons outside their bodies, while humans have endoskeletons inside. Our bones are in axial (skull, ribcage, spine) and appendicular (arms, legs) groups.

Actin filaments can assemble and disassemble quickly, and this property allows them to play an important role in cell motility (movement), such as the crawling of a white blood cell in your immune …

Review your understanding of cell parts and functions in this free article aligned to NGSS standards.

Explore the structure and function of the liver's hepatic lobule, focusing on the portal triad and its role in nutrient and oxygen supply. Learn how hepatocytes extract nutrients for metabolism and storage, …