Life Sciences Glossary: From Linkage Group to Labour and Lacrimal

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Linkage Group

All of the genes located physically on a given chromosome.

Linkage Map

A scale representation of a chromosome showing the relative positions of all its known genes.

Lipase

An enzyme that accelerates the hydrolysis or synthesis of fats.

Lipids

Hydrophobic molecules that function as energy storage molecules, signaling molecules and the major components of the cell membrane.

Littoral

The region of shallow water near the shore between the high and low tide marks.

Liver

The largest gland of the body and one of the most important complex organs.

Living Fossil

An existing species having similarity to ancient ancestral species, e. g. Latimore, a living coelacanth fish.

Lockjaw

An acute fatal infection of the central nervous system caused by an exotoxin produced by clostridium tetanic, an anaerobic bacillus, more commonly known as tetanus.

Loop of Henley

After Friedrich G. J. Henley; the U-shaped portion of nephron with descending and ascending limbs.

Lumbar

Region of the back and side between the ribs pelvis.

Lumen

The space within an artery, vein, intestine or tube.

Lung

One of a pair of light, spongy important organs in the thorax, constituting the main component of the respiratory system.

Lymph

The tissue fluid which drains into and through the lymphatic system.

Lymph Node

One of the many small oval structures that filter the lymph and fight infection.

Lymphocyte

A type of granular leucocyte found in lymph nodes, associated with the immune system.

Lymphocytosis

The multiplication of lymphocytes as occurs in certain chronic diseases.

Lymphoma

A cancer of lymphoid cells.

Lysine

An essential amino acid needed for proper growth in infants.

Lysogenic

A viral infection leading to integration of an inactive copy of viral DNA into the cell genome.

Lysolecithin

A hemolytic substance formed in the spleen of a malaria patient breaking down defective red blood corpuscles.

Lysosomes

Cytoplasmic organelle containing hydrolytic enzymes involved in intracellular digestion.

Lysozyme

Anti- bacterial enzyme present in phagocytic cell, tears and saliva which digests peptidoglycans in bacterial cell walls.

Lysosome

The cell body inside the plasma membrane.

Labia Major

Two long lips of skin, one on each side of the vaginal orifice outside the labia minor.

Labia Minor

Two folds of skin between the labia major, extending from the clitoris backward on both sides of the vaginal orifice.

Labour

The time and the processes that occur during parturition or childbirth.

Lacrimal

Pertaining to tears.

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