B3 - Organism level systems definitions 0.0 / 5 ? BiologyOrganism level systemsGCSEOCR Created by: munchlee142002Created on: 02-03-18 23:36 Stimulus A change in the environment 1 of 27 Receptors Sensory cell that detects a stimulus 2 of 27 Effectors Muscles and glands which respond to impulses from the nervous system 3 of 27 Glands Secrete hormones into the blood stream 4 of 27 Central Nervous System Brain and spinal cord - where nervous information is processed 5 of 27 Sensory neurones Transmits impulse from receptor cells 6 of 27 Relay neurones Neurones that carry electrical impulses from sensory neurones to motor neurones 7 of 27 Motor neurones Transmits impulse from CNS to effector 8 of 27 Reflex action Rapid automatic nervous response that does not involve the brain 9 of 27 Reflex arc Pathway followed by a nervous impulse during a reflex action 10 of 27 Hormone Chemical secreted by glands in the body 11 of 27 Endocrine glands Gland which produces and secretes a hormone 12 of 27 Endocrine system All the endocrine glands and the hormones they produce 13 of 27 Diabetes Medical condition which affects a person's control of blood sugar levels 14 of 27 Target organs Organ a hormone has an effect on 15 of 27 Homeostasis Maintenance of a constant internal environment 16 of 27 Adrenaline Hormone released during stress. It causes changes which make the body ready for action 17 of 27 Negative feedback A system that detects a change in a condition. The system then acts to return conditions to the desired level 18 of 27 Ovulation Release of a mature egg from an ovary 19 of 27 Oestrogen Female hormone that causes the lining of the uterus to build up 20 of 27 Follicle-stimulating hormone (FSH) Female hormone that causes an egg to mature and stimulates the ovaries to produce oestrogen 21 of 27 Glucagon Hormone which stimulates the liver to turn glycogen into glucose, increasing blood sugar levels 22 of 27 Luteinising hormone (LH) Female hormone that triggers ovulation 23 of 27 Progesterone Female hormone that maintains the uterus lining during pregnancy 24 of 27 Contraception Technique used to prevent pregnancy 25 of 27 Fertility treatment Technique used to increase a woman's chance of getting pregnancy 26 of 27 Insulin Hormone which stimulates the liver to turn glucose into glycogen, decreasing blood sugar levels 27 of 27
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