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physiology exam 3
Terms in this set (25)
The amount of blood leaving the heart with every beat:
What is Stroke Volume
The P wave and QRS complex represent these physiological responses during each cardiac cycle:
What is Atrial depolarization and Ventricular depolarization, respectively?
The vessels primarily responsible for controlling blood flow:
What are the arterioles?
The percentage of blood volume that is ejected from the heart during each cardiac cycle (beat):
What is Ejection Fraction?
End-diastolic volume (EDV) minus (-) End-systolic volume (ESV) equals (=):
what is stroke volume?
The maximum total O2-carrying capacity for a person with a blood volume of 5 L is approximately:
What is 1 L of oxygen (O2)?
The process of gas exchange in the lungs between the alveoli and the capillary blood is known as:
What is pulmonary diffusion?
The most important factor for determining the rate of pulmonary diffusion:
What is the partial pressure of gases?
The exchange of O2 and CO2 between the capillary blood and the metabolically active tissue:
What is capillary diffusion?
The primary factors that decrease O2 binding to hemoglobin and shifts the oxyhemoglobin curve to the right:
What are a decreased pH and an increased temperature?
This is NOT considered a key mechanism associated with fatigue?
What is decreased recruitment of Type II fibers?
The depletion of this will likely account for the fatigue experienced by an endurance athlete.
What is glycogen?
As exercise increases core temperature, the build of heat in muscle will contribute to fatigue by causing this to occur:
glycogen depletion speeds up
Acetylcholine affects the sinoatrial node by:
What is promoting hyperpolarization?
A normal resting heart rate is determined by:
parasympathetic nervous system
Heart Rate x Stroke Volume =
The anatomical structure of the cardiac conduction system that is located in the right atrium:
What is the sinoatrial (SA) node?
This occurs in the heart during the diastolic phase of the cardiac cycle:
right and left ventricles fill with blood
Sympathetic stimulation of blood vessels (i.e. arterioles) results in:
The Fick Equation
VO2 = Q x a-vO2 difference
The strongest stimuli to breathe more deeply and more frequently:
increased concentration of CO2, decreased O2, increased hydrogen ions (H+)
The amount of air remaining in the lungs after maximal expiration
Residual Volume (RV)
The greatest amount of air that can be expired after a maximal inspiration
The amount of air entering and leaving the lungs during normal breathing
The two major functions of pulmonary diffusion
replenishing blood O2 supply and removing CO2 from the blood