RECEPTORS AND EFFECTORS

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Presentation transcript:

RECEPTORS AND EFFECTORS SENSES, MUSCLES AND BONES

SENSORY RECEPTORS receptor stimuli sense Photoreceptors light Eyes Mechanoreceptors Changes in movement, pressure, waves, sound, contact, pain Ears Skin Muscles Chemoreceptores Chemical changes Taste Smell Thermoreceptors Changes in temperature skin

Eyes and Ears EYE Anatomy Ear anatomy

Sight Regulation of the intensity of light: pupil. It does this through the contraction or relaxation of muscles located in the iris. Focusing the images in the retina: lens. It does this through the muscles of the ciliary body. Flat: destant objects Curved: near

Sensory cells Sensory cells are located in the retina. This layer is composed of different neurons adapted to recieve different intensity of light or different colors. (Rodes and cones) The neurons will form a nerve, the optic nerve, to send the information to the brain.

Hearing and balance Vibrations reach the eardrum. Then it is transmitted through the bones of the middle ear. This action causes the fluid in the inner ear to vibrate stimulating the cells of the cochlea, which make up the organ of Corti. This organ is made up of neurons that form a nerve, the auditory nerve. The vestibule contains perilimph that runs inside the three channels (semicircular channels) and two vesicles (utricule and sacule). Limph movements determine the position along with vision and other mechanoreceptors.

Touch

Skin receptors receoptor Stimuli Nerve endings (surface) Pain Krause corpuscle Cold Ruffini corpuscle Heat Meissner corpuscle Touch Pacinian corpuscle pressure

Taste and smell Stimuli: chemical substances in food Receptors: taste buds Place: mouth Stimuli: chemical substances in air Receptors: olfactory cells in olfactory bulbs Place: nasal cavities 3000 different smells

Locomotion Passive parts: bones Active parts: muscles Bones give the body structure and support. Muscles are attached to bones, and move them.

Bones Bones are formed by the ossification of cartilage. Calcium is needed for stronge bone growth. Functions: Support Shape Protection Attachments for muscles Produce red blood cells

Long bones

Bones: short and flat bones

Joints There are three kinds of joint: fixed, movable, and semi- movable. Fixed joints stop the bones from moving. Skul. Movable joints allow us to move. They contain a lubricating liquid, called synovial fluid. They also have ligaments, which keep the bones united. Elbow. Semi-movable allow only limited movements. Vertebrae.

Skull

Muscles Muscles are made up of muscle-fibre bundles. Each bundle contains many long elongated muscle fibres. When they join up the protective coverings form a special kind of tissue called tendons, which connect a muscle to a bone. Muscles contract by becoming shorter. The energy is obtained from cellular respiration. To produce the desired movement, various muscles must be coordinated at the same time. They are called agonist, they work agains other muscles called antagonists: one contracts and the other relaxes.

Human muscles