Wk 6 - LE 11: Cardiovascular (regulating BP in exercise) Flashcards
High blood pressure in large arteries is linked to _____ contraction
ventricular
Does blood pressure oscillate or remain constant in the arterial circulation?
Oscillates
Blood pressure falls considerably within what vessels?
The resistance vessels (capillaries & venules -> microcirculation)
Systole is when the heart ______
Contracts
Diastole is when the heart __
Relaxes
Why do the pulmonary and systemic circuits have such great pressure difference when the same amount of blood flows through both?
The resistance (and pressure) is lower in the pulmonary circuit
The heart spends more time in _____ than it does in ______
diastole, systole
Is your heart rate ever constant?
No, it constantly varies
Does BP increase or decrease with age?
BP increases (due to stiffening of arteries)
Peak BP in training is affected by training level of the individual (T/F)
FALSE. It is NOT affected
Peak BP takes longer to achieve in trained people (T/F)
TRUE
Theres about a ____% increase in MAP in max exercise
30%
The pulse pressure is the difference between….
The systolic and diastolic pressures
Is the blood pressure constant throughout the systemic circuit?
No
Changes in resistance cause changes in ____
cause
Changes in flow and resistance cause changes in _______
pressure
If volume increases, _____ will increase
pressure
MAP = _____ x _____
MAP = CO x TPR
MAP varies considerably (T/F)
False
CO and TPR can vary considerably (T/F)
True (they are the controlled variables)
The cardiovascular system restores blood pressure to its set-point when it alters suddenly. What is this called?
A baroreflex ( or arterial baroreceptor reflex)
Baroreceptors are located in the ….?
Aorta and carotid artery (most important)
Sensing: If blood pressure falls nerve fire will ______ frequency to brainstem
increase
Sensing: If blood pressure increases nerve fire will ______ frequency to brainstem
decrease
Adjusting: If blood pressure falls nerve fire will ______ frequency AWAY from brainstem to body
increase
Adjusting: If blood pressure is high nerve fire will ______ frequency AWAY from brainstem to body
decrease
When does the baroreflex operate?
All the time
