2_______ is the process by which organisms keep internal conditions relatively constant despite changes in external environment:aOsmosisbApoptosiscHomeostasisdAnhydrobiosisShow answer
3Which of the followings respond to changes in either external or internal environment?aEffectorsbMusclescReceptorsdControl centerShow answer
4Which component of control system of homeostasis responds to the commands of the control center by either opposing or enhancing the stimulus:aEffectorsbTransducercReceptorsdSensory organsShow answer
5Which hormone is responsible for contraction of uterus during childbirth?aInsulinbCalcitonincOxytocindPTHShow answer
6Which term covers the rest of the three?aOsmoregulationbExcretioncThermoregulationdHomeostasisShow answer
7What is the primary function of homeostasis?aTo maintain a stable internal environmentbTo increase body temperaturecTo produce energydTo eliminate all wastesShow answer
8Which element of homeostasis detects changes in the environment?aEffectorbControl centrecReceptordGlandShow answer
9The control centre in homeostasis is typically the:aMusclesbBrain and spinal cordcSkindBlood vesselsShow answer
10Which of the following acts as an effector in thermoregulation?aHypothalamusbSweat glandscThermoreceptorsdBloodShow answer
11In negative feedback, the response of the system is to:aAmplify the initial stimulusbReduce the initial stimuluscIgnore the stimulusdReverse the stimulus completelyShow answer
12Which is an example of negative feedback?aBlood clottingbChildbirth contractionscRegulation of blood glucosedLactationShow answer
13Positive feedback mechanisms are:aCommon in homeostasisbLess common than negative feedbackcAlways harmfuldUsed for temperature regulationShow answer
14During childbirth, the release of oxytocin is an example of:aNegative feedbackbPositive feedbackcHomeostatic imbalancedThermoregulationShow answer
16Which part of the brain acts as the thermoregulatory centre?aCerebrumbCerebellumcHypothalamusdMedulla oblongataShow answer
17Receptors that detect changes in blood pressure are found in:aSkinbBlood vesselscMusclesdGlandsShow answer
19The output of a negative feedback system:aIncreases the activity of the systembDecreases the activity of the systemcHas no effect on the systemdCauses the system to stopShow answer
20Which of the following is not a component of homeostatic control?aReceptorbEffectorcStimulusdControl centreShow answer
