Detecting and regulating change Flashcards
What is a receptor?
a receptor is a structure that is able to detect a change in the body’s internal and external environment.
What are the different types of receptors?
thermoreceptors, touch receptors, osmoreceptors, chemoreceptors and pain receptors
What are the functions of a thermoreceptor?
Informs the brain of changes of the external temperature.
information is received by the hypothalamus and cerebrum so we are constant aware of the temperature
used to maintain homeostasis
what are the functions of a Osmoreceptor?
hypothalamus detects osmotic pressure
osmotic pressure is the concentration of substances dissolved in the water of the blood plasma
What are the functions of Chemoreceptors?
stimulated by particular chemicals
present in the nose and mouth giving us sensitivity to odour and taste
Also chemoreceptor detect changes in pH, 02 and CO2 levels
what are the functions of touch receptors?
Mainly found on the skin surface
gives you the sense of feel
occur in greater concentrations in areas such as lips, fingertips and external organs
What are the functions of pain receptors?
stimulated by damage to the tissues such as a cut, by poor blood flow to a tissue or excessive stimulation from stimuli such as heat or chemical
what is a reflex?
A reflex is a rapid, automatic response to a change in the external or internal environment
what are the four properties of a reflex?
1) stimulus- trigger for a reflex
2) involuntary - occurs without any conscious thought
3) rapid- only a small number of neurons involved
4) stereotyped- occurs in the same way each time
What is homeostasis?
It is the process of keeping the environment inside of the body fairly constant
What are the aspects of internal environment the body needs to regulate?
pH level core body temperature glucose in the blood conc. of co2 and o2 conc. of metabolic waste blood pressure
What is positive feedback and give a example of positive feedback
response to a stimulus and intensifies stimulus
oxytocin
