< Anatomy and Physiology of Animals < Glossary 
      A-B | C-D | E-F | G-H | I-J | K-L | M-N | O-P | Q,R,S | T,U,V,W,X,Y,Z
| Word | Meaning | 
|---|---|
| I | |
| Ileum | The terminal part of the small intestine | 
| Immunity | Being resistant to injury or invasion by microorganisms | 
| Implantation | The attachment of blastocyst to lining of uterus | 
| Impotence | The inability to copulate | 
| Incisors | The chisel-shaped ‘biting off’ teeth at the front of the mouth | 
| Induced ovulation | When ovulation is stimulated by mating as in cat and rabbit | 
| Inferior | Towards the lower part of the body. Not used in animals except, perhaps, higher apes | 
| Infertility | The inability to conceive or cause conception | 
| Inflammation | A localised protective response to tissue injury | 
| Ingestion | The taking in of food, liquids etc. | 
| Inguinal | To do with the groin | 
| Inorganic | Compounds that lack carbon | 
| Insertion | The attachment of a muscle tendon to a bone that moves | 
| Inspiration | Breathing in | 
| Insulin | A hormone produced by the pancreas. Decreases blood glucose levels | 
| Intercostal muscles | The muscles between the ribs. | 
| Internal | Away from the surface of the body | 
| Interstitial fluid | Extracellular fluid surrounding the cells | 
| Intervertebral disc | A pad of cartilage between the vertebrae | 
| Intestinal juice | Digestive secretion produced by glands in the lining of the small intestine | 
| Intracellular fluid | Fluid within the cells | 
| Invertebrates | Animals that do not posses a backbone or vertebral column | 
| Ion | A charged particle | 
| Isotonic | Having an osmotic pressure equal to that of a solution with which it is compared | 
| J | |
| Jejunum | The middle portion of the small intestine | 
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