Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
18 Cards in this Set
- Front
- Back
|
What is a stimulus? |
Change in an organism's external environment |
|
|
What is a receptor? |
Detects the stimulus |
|
|
What is an effector? |
Carries out a response to connector to the effect of the stimulus |
|
|
What are the stages in a reflex arc? |
stimulus→receptor→coordinator→effector→ response |
|
|
List the source and effect of 3 hormones |
Insulin (pancreas), adrenaline (pituitary gland) and oestrogen (ovaries) |
|
|
Describe the function of the iris |
Controls the size of the pupil when light entering the eye |
|
|
Why is it important to be able to detect changes in their external environment? |
So the bodies are stimulated around by them, which keeps them insulated |
|
|
What type of neuron carries information from a sense organ to CNS? |
Sensory neuron |
|
|
What is the name given to the gap between 2 neurones? |
Synapse |
|
|
Name two parts of the body which make up the CNS. |
Brain and spinal cord |
|
|
What is the definition of homoeostasis? |
The ability of the body or a cell to maintain a condition of equilibrium or stability within its internal environment when dealing with visible changes. |
|
|
List 4 homeostatic organs in the body |
Lungs, pancreas, skin and kidneys |
|
|
Compare thermoregulation when we are hot and cold |
Heat loss and increase in sweat in hot conditions and heat gains and decrease in sweat in cold conditions |
|
|
List 3 major differences between the nervous system and the endocrine system |
The nervous system is a chemical, electrical system using neurones. Endocrine system is a chemical system using hormones in the blood |
|
|
Name the different photoreceptors in the eye, and describe the differences between them |
Rods are sensitive to light and darkness; cones are responsible for colour vision. |
|
|
Explain how the pupil becomes constricted in bright light |
The circular muscles of the iris contract and the radial muscles relax. |
|
|
Describe the ciliary muscles, suspensory ligaments and shape of lens during accommodation of a close object |
Ciliary muscles: contract Suspensory ligaments: slacken Lens: gets thicker |
|
|
The nervous system coordinated responses to stimuli. Name the other communication system in the body that coordinated responses to stimuli |
Endocrine system |
