M/C Flashcards
During physical exercise our bodies primary source of energy are:
Carbohydrates and fats.
In which blood vessel does gas exchange occur
Capillaries
What is the significance of the P wave in the electrocardiogram
Atrial contraction
Blood returning to the heart from the hand enters through the
Superior vena cava
Redistribution of blood flow during exercise involves
Increase in vasoconstriction of arterioles supplying inactive areas and less vasoconstriction of the arterioles in active muscle
A myocardial infarction is the result of a blockage of
Coronary arteries
Which energy system uses fatty acids, glucose, and glycogen to make ATP
aerobic
White muscle fibres are
Type IIB muscle fibres
The final form of “free energy” that can be used for muscle contraction is
ATP
The ATP-PC metabolic pathway is considered
Anaerobic alactic
Cellular respiration involves which of the following energy sub-pathways
Glycolysis, Krebs cycle, electron transport
Lactic acid removal requires how many minutes of rest recovery
60-120
To be useable as sources of energy, the nutrients (proteins, fats, and carbohydrates) in our food must be resynthesized in our bodies into
Adenosine triphosphate
The tissue signals the ventricles to contract
AV node
The structure in the heart is sometimes referred to as the hearts “pacemaker”
The sinoatrial node
