The frank-starling mechanism is a compensatory response to heart failure that can support cardiac output but also worsen heart failure. which statements regarding this mechanism are correct? select all that apply.

• Decrease in cardiac output causes an increase in preload. 
• Diuretics reduce blood volume and myocardial oxygen demand. 
• Excessive stretch on the ventricular wall will decrease preload.

Frank-starling mechanism showing the relation of the end diastolic pressure (EDP) and the contraction power(calculated by stroke volume).

In heart failure, failure to pump the blood(decrease in cardiac output) will increase the preload/EDP. The diuretic can decrease blood volume which will reduce the amount of blood the heart has to pump. Stretching of muscle will decrease the EDP and decrease the preload as well.

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.

Be prepared.experiment breaking point of rubber bands measured in certain amount of temperature communication

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