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General nature or nature terms.

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lymph hearts

Biology; General

Contractile enlargements of vessels that pump lymph back into the veins; found in fish, amphibians, and reptiles.


Biology; General

Sac-like structures of varying complexity where blood and air exchange oxygen and carbon dioxide; connected to the outside by a series of tubes and a small opening. In humans, the lungs are situated ...


Biology; General

White blood cells that arise in the bone marrow and mediate the immune response; include T cells and B cells.


Biology; General

Membrane-enclosed organelles containing digestive enzymes. The lysosomes fuse with food vacuoles and enzymes contained within the lysosome chemically breakdown and/or digest the food vacuole's ...

luteal phase

Biology; General

The second half of the ovarian cycle when the corpus luteum is formed; occurs after ovulation.

labia majora

Biology; General

The outer folds of skin that cover and protect the genital region in women.

luteinizing hormone (LH)

Biology; General

A hormone secreted by the anterior pituitary gland that stimulates the secretion of testosterone in men and estrogen in women.

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