Anatomy and Physiology of Animals/Glossary/K-L

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Word Meaning
Keel The breast bone in birds
Keratin A protein found in epidermis, hair, feathers, hoofs etc.
Kidney The organ that produces urine
Lachrymal gland

The tear gland of the eye


The secretion and ejection of milk by mammary glands|

Lacteal A lymphatic vessel within the villi of the small intestine
Lacuna A small hollow space
Lamellae Concentric rings of hard calcified material found in compact bone
Large intestine Part of the gut consisting of the colon, caecum, rectum and anal canal
Larynx The voice box
Lateral Away from the midline
Lens Transparent part of the eye that helps focus light rays on the retina
Leukocyte A white blood cell

Dense connective tissue that attaches bone to bone

Lipase Digestive enzyme that breaks down fats (lipids)
Lipid Fat
Liver The large organ caudal to the diaphragm
Longitudinal Lengthwise slice of an animal or organ
Lordosis response

Standing firm to pressure on the loin region

Lumbar Loin region of the back
Lumen A space within an artery, vein, intestine or tube
Lung The organs of respiration
Luteinising hormone

The hormone from the anterior pituitary gland that stimulates ovulation and development of corpus luteum

Lymph Tissue fluid that has entered the lymphatic system
Lymph node A structure that filters lymph and produces lymphocytes
Lymphatic capillary The closed ended microscopic vessel that collects lymph in tissues
Lymphatic tissue Specialised tissue that contains large numbers of lymphocytes
Lymphatic vessel A large vessel that carries lymph
Lymphocyte A white blood cell associated with the immune response
Lysosome A cell organelle that contains digestive enzymes