Flashcards in Co-ordination Deck (45):
an organism that is composed of many cells. Most plants and animals are multicellular.
the maintenance of a relatively constant internal physiological environment of the body or part of the body (e.g. blood glucose level, pH, body temperature) in varying external conditions
a system in which any changes or variations (stimuli) in the internal environment are detected (by receptors); if a response is required, this is communicated to effectors to bring about some type of change or correction so the conditions can be brought back to normal
a response that reduces the original stimulus
a simple carbohydrate and the simplest form of sugar
large gland in the body that produces and secretes the hormone insulin and an important digestive fluid containing enzymes
the main storage carbohydrate in animals, converted from glucose by the liver and stored in the liver and muscle tissue
hormone that removes glucose from the blood and stores it as glycogen in the liver and muscles
a reaction in which the response is in the same direction as the stimulus—for example, during childbirth the onset of contractions activates the release of the hormone oxytocin, which stimulates further contractions
hormone secreted from the pituitary gland that assists in the formation of bonds between mothers and their babies, and perhaps between people in close relationships
the system of nerves and nerve centres in an animal in which messages are sent as an electrical and then a chemical impulse. It comprises the central nervous system and the peripheral nervous system.
the body system of glands that produce and secrete hormones into the bloodstream in order to regulate processes in various organs
a chemical involved in transmitting information between cells
Central nervous system
the part of the nervous system composed of the brain and spinal cord
Peripheral nervous system (PNS):
made up of sensory and motor neurons. It connects the central nervous system to the rest of the body, and detects and responds to change.
a nerve cell in the sense organs. It detects change in the environment and sends a message to the central nervous system.
the nerve cell that causes an organ, such as a muscle or gland, to respond to a stimulus
chemical released from the axon terminals into the synapse between your nerve cells (neurons) during a nerve impulse
organs that produce hormones. Endocrine glands release their hormones into the bloodstream for transport to target organs.
chemical substances produced by glands and circulated in the blood. Hormones have specific effects in the body.
Thermoregulation: the control of body temperature
Thermostat: a device that establishes and maintains a desired temperature automatically
a specialised structure that detects stimuli (such as light, sound, touch, taste and smell) in your environment
changes in the environment that can be detected and responded to
special cells located in your skin, part of your brain and body core that are sensitive to temperature
special cells within the skin, inner ear and skeletal muscles that are sensitive to touch, pressure and motion, enabling you to balance, hear and sense pressure and movement
special cells within a sense organ (especially the nose and tastebuds) that are sensitive to particular chemicals, giving you the sensations of smell and taste
a receptor cell located in your eye that is stimulated by light, converting it to electrical energy that is sent to the brain, giving you the sensation of light
special cells located throughout the body (except the brain) that send nerve signals to the brain and spinal cord in the presence of damaged or potentially damaged cells, resulting in the sensation of pain
Hot thermoreceptors: a type of receptor in your skin that can detect an increase in skin temperature above 37.5°C (normal body temperature)
Cold thermoreceptors: a type of receptor in your skin that can detect a decrease in skin temperature below 35.8 °C
Olfactory nerve: nerve that sends signals to the brain from the chemoreceptors in the nose
Pupil: a hole through which light enters the eye
coloured part of the eye that opens and closes the pupil to control the amount of light that enters the eye
a quick response to a stimulus. Reflex actions do not involve thought.
Cornea: the curved, clear outer covering of your eye
a transparent curved object that bends light towards or away from a point called the focus. The eye has a jelly-like lens.
curved surface at the back of the eye. It is lined with sight receptors.
Short-sightedness: the condition of not being able to see clearly things that are far away
Long-sightedness: the condition of not being able to see clearly things that are close
Optic nerve: large nerve that sends signals to the brain from the sight receptors in the retina
sensory receptors in the retina that respond to low levels of light and allow you to see in black and white in dim light
sensory receptors in the retina that respond to red, green or blue light. Cones are mainly in the central part of the retina.
Colour blindness: an inherited condition, more common in males, in which a deficiency of one or more of the different types of cones may mean that you find it difficult to see a particular colour or combinations of colours