| Term | Definition |
|---|---|
| pericardial sac | Is a double-walled Hits - 903 |
| pericardium | The membrane enclosing the heart, consisting of an outer fibrous layer and an inner double layer of serous membrane Hits - 867 |
| perichondrium | The connective tissue that envelops cartilage where it is not at a joint Hits - 1006 |
| perimysium | The sheath of connective tissue surrounding a bundle of muscle fibres Hits - 867 |
| periosteum | A dense layer of vascular connective tissue enveloping the bones except at the surfaces of the joints. Hits - 1093 |
| peripheral nervous systems | Is the nervous system outside the brain and spinal cord Hits - 883 |
| peristalsis | Is the involuntary constriction and relaxation of the muscles of the intestine or another canal, creating wave-like movements that push the contents of the canal forward. Hits - 906 |
| peritoneum | The smooth transparent serous membrane that lines the cavity of the abdomen of a mammal and is folded inward over the abdominal and pelvic viscera. Hits - 864 |
| pesticides | A substance used for destroying insects or other organisms harmful to cultivated plants or to animals Hits - 891 |
| pharyngeal | Pharyngeal muscles Hits - 887 |
| pharyngeal mucosa | Is a space in the deep compartment of the head and neck, located between the fascia of the Hits - 1001 |
| pharynx | The membrane-lined cavity behind the nose and mouth, connecting them to the oesophagus. Hits - 854 |
| pharynx caudal | Is the part of the Hits - 871 |
| phenomenon | An Occurrence, or circumstance observed or observable: to study the Hits - 936 |
| phenotype | Is the term used in genetics for the composite observable characteristics or traits of an organism. The term covers the organism's morphology or physical form and structure, its developmental processes, its biochemical and physiological properties, its behavior, and the products of behavior. Hits - 960 |