EPT3
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Place the following events in sequence for a normal EKG: (1) Purkinje fibers, (2) SA node, (3) bundle of His, (4) AV node
2, 4, 3, 1
These are known as resistance vessels:
Arterioles
The Peripheral Nervous System acts through the ___
Vagus Nerve
Supine exercises lead to a ___ in venous return to the heart
Increase
Venous return is aided during exercise by which of the following?
(All the above) • One way valves • Muscular contractions around veins (i.e “muscle pump) • Pressure changes in the abdominal and thoracic cavities (i.e “respiratory pump”)
Functions of blood that are important during exercise include:
(A, C, and D only) • Transportation • Temperature regulation • Acid-Base Balance
As a result of training, a shorter recovery heart rate is due to an increased ___
Vagal tone
Blood doping will ___ the viscosity of the blood
Increase
Cardiac output is calculated as:
Q = HR x SV
With endurance training, we see adaptations in the muscle including:
(B, C, and D are correct) • Increased myoglobin • Increased number of mitochondria • Increased size of mitochondria
Endurance training should aim to improve:
(A and B only) • VO2max • Lactate threshold
A resting heart rate below 60 bpm is termed ___
Bradycardia
Premature ventricular contractions are characterized by a ___
Wide QRS complex
The ___ is an estimation of the heart’s oxygen demand
Rate pressure product
Respiratory exchange ratio ___ due to ___ with endurance training
Decreases; Increased utilization of free fatty acids
Blood flow to exercising muscle increases due to ___
(All the above) • Increased capillarization of trained muscle • Increased mitochondrial density • Increased enzyme activity
Total blood volume increases with endurance training due to:
(A and B are correct) • Increases in hemoglobin • Total number of red blood cells increases
End-diastolic volume and end-systolic volume are used to calculate which variable?
Stroke Volume
A gradual decrease in stroke volume while seeing a subsequent increase in heart rate describes:
Cardiovascular drift
Sympathetic nervous system triggers he release of the ___, which increases heart contractility.
Catecholamines
Normal resting heart rate is between 60-100 bpm and a HR above 100 is called tachycardia
True
According to the 2018 Physical Activity Guidelines, adults need 150 minutes of moderate intensity physical activity per week in a minimum of 10 minute bouts
False
Changes in blood flow resistance result from contraction/relaxation of the capillaries
False
High pressure is in the venous side of blood flow because it is closer to the driving force and closer to the heart
False