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Hace 1 día · DNA, organic chemical of complex molecular structure found in all prokaryotic and eukaryotic cells. It codes genetic information for the transmission of inherited traits. The structure of DNA was described in 1953, leading to further understanding of DNA replication and hereditary control of cellular activities.
Hace 4 días · There are two basic cell types within the nervous system: neurons and neuroglial cells. The neuron. In the human brain there are an estimated 85 billion to 200 billion neurons.
Hace 1 día · T cell, type of leukocyte (white blood cell) that is an essential part of the immune system. T cells are one of two primary types of lymphocytes—B cells being the second type—that determine the specificity of immune responses to antigens (foreign substances) in the body.
- The Editors of Encyclopaedia Britannica
List three functions of lymph. return to the bloodstream most of the small proteins filtered by the blood capillaries. transport foreign particles to lymph nodes. transport dietary fats to the bloodstream. List three cell types found in lymphatic tissue. B cells.
Hace 3 días · The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a lipid bilayer that is semipermeable. The cell membrane regulates the transport of materials entering and exiting the cell.
Hace 5 días · Explore the system that includes the largest organ in the human body. Use 3D models and accompanying detailed descriptions to learn about the anatomy and physiology of our skin, hair, nails, and exocrine glands. The integumentary system is an organ system consisting of the skin, hair, nails, and exocrine glands.
Hace 5 días · Bone marrow is a spongy organ in the center of bones where stem cells produce several types of blood cells. Reviewed by a board-certified physician.
