< 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 | 
|---|---|
| E | |
| Echolocation | The use of high frequency sound like sonar and radar by animals (i.e. whales and bats) to locate objects in the surrounding environment | 
| Effector | A muscle or gland that responds to a motor neuron impulse | 
| Egestion | The elimination of indigestible waste products from the body | 
| Electrolyte | A compound that separates into charged particles or ions | 
| Electron microscope | A microscope that focuses an electron beam through a specimen, resulting in resolving power a thousandfold greater than that of a light microscope | 
| Element | Any substance that cannot be broken down to any other substance | 
| Embryo | The young of any organism in an early stage of development | 
| Emulsification | The breakdown of large fat particles to smaller ones in the presence of bile | 
| Enamel | The hard white substance covering the crown of teeth | 
| Endocrine gland | A ductless gland that secretes hormones into the blood | 
| Endometrium | The inner lining of the uterus | 
| Endoplasmic reticulum | The network of membranous channels running through the cytoplasm of cells | 
| Endothelium | The layer of squamous epithelium that lines blood vessels | 
| Enzyme | A substance that increases the speed of a chemical reaction | 
| Eosinophil | A white blood cell with granules in the cytoplasm | 
| Epidermis | The thin outer layer of the skin | 
| Epididymis | The organ composed of convoluted tubules that lies on the border of the testis Where sperm mature | 
| Epiglottis | The cartilage on the top of the larynx that closes the windpipe during swallowing | 
| Epiphyseal line | The remnant of epiphyseal plate at end of long bone | 
| Epiphyseal plate | The cartilaginous plate at the end of a long bone where bone growth occurs | 
| Epiphysis | The end of a long bone | 
| Epithelial tissue | Tissue that forms outer part of skin, lines blood vessels, hollow organs and passages in the body | 
| Erythrocyte | A red blood cell | 
| Essential amino acids | The 10 amino acids that can not be made by animals and must be acquired in the diet | 
| Eustachian tube | The passage connecting middle ear to pharynx. Equalises air pressure in middle and outer ear | 
| Evolution | All the changes that have transformed life on Earth from its earliest beginnings to the diversity that characterizes it today | 
| Excretion | To cast out material from the body, cell or tissue | 
| Exocrine gland | A gland that secretes substances into a duct | 
| Exocytosis | The discharge of substances through the plasma membrane | 
| Expiration | Breathing out | 
| Extension | Bending of a joint so that the angle between the bones increases | 
| Extracellular fluid | Fluid outside body cells | 
| F | |
| Facilitated diffusion | Diffusion across a membrane using a carrier substance | 
| Fallopian tube | A slender tube through which eggs pass from an ovary to the uterus | 
| Fats | Biological compounds consisting of three fatty acids linked to one glycerol molecule | 
| Feedback system | The sequence of events where information about the status of a situation is continually fed back to the central control region | 
| Femur | The long bone between the pelvis and the knee | 
| Fertilisation | Penetration of ovum by sperm and union of nuclei | 
| Fetlock | The joint between the metacarpals or metatarsals and the phalanges in horse | 
| Fibrin | The insoluble protein formed from fibrinogen | 
| Fibrinogen | The protein in blood plasma essential for blood clotting | 
| Fibula | The lateral bone of the lower hind limb | 
| Filtrate | The fluid produced by filtration of blood in the nephron | 
| Flagellum | A long hair like process e.g. tail of sperm | 
| Flexion | The movement involving decreasing the angle between two bones | 
| Fluoroxylate | An anticoagulant used for biochemical tests for glucose | 
| Foetus | Later stage of development of a young animal | 
| Follicle | The cavity surrounding the developing ovum | 
| Follicle stimulating hormone (FSH) | Hormone secreted by anterior pituitary gland. Stimulates development of ovarian follicle | 
| Foramen | A hole in a bone for passage of vessels or nerves | 
| Foramen magnum | The hole at the base of the skull for passage of the spinal cord | 
| Fossa | A furrow or shallow depression in a bone | 
| Fovea | The area of the retina of greatest concentration of cone cells. Area of sharpest vision | 
| Functional caecum | The enlarged large intestine and caecum occupied by cellulose digesting micro-organisms | 
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