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General

General nature or nature terms.

Contributors in General

General

sarcomeres

Biology; General

The functional units of skeletal muscle; consist of filaments of myosin and actin.

second messenger

Biology; General

The mechanism by which nonsteroid hormones work on target cells. A hormone binds to receptors on the cell's plasma membrane activating a molecule&emdash;the second messenger&emdash;that activates ...

spleen

Biology; General

An organ that produces lymphocytes and stores erythrocytes.

spongy bone

Biology; General

The inner layer of bone; found at the ends of long bones and is less dense than compact bone. Some spongy bone contains red marrow.

saturated fat

Biology; General

A fat with single covalent bonds between the carbons of its fatty acids.

secretin

Biology; General

A hormone produced in the duodenum that stimulates alkaline secretions by the pancreas and inhibits gastric emptying.

spongy mesophyll

Biology; General

Parenchyma cells found in plant leaves that are irregularly shaped and have large intracellular spaces.

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