Lessons in Elementary Physiology

action afferent afferent nerve amount animal aorta arteries auditory auricle becomes blood blood-vessels body bone brain branches called canal capillaries carbonic acid cartilage cavity central centre cerebellum cerebral hemispheres changes clot colour connective tissue contains contraction cortex duct efferent elastic epidermis epithelium external filaments fissure fluid front ganglion give rise gland grammes grey matter heart heat Hence impulses inch inner intestine layer lens lever ligament liver lungs lymph lymphatic medulla molecular motor movements mucous membrane muscles muscular fibres nerve cells nerve fibres nerve-fibres nervous system neurilemma nitrogen nucleus optic nerve organ outer oxygen papillæ pass pia mater plasma posterior root pressure proteins quantity red corpuscles retina rods seen sensations sensory side skin spinal bulb spinal cord spinal nerves structure substance supply surface thoracic tract transverse valves vaso-motor veins ventricle vessels vibrations walls white matter