lect 28. Blood pressure, cardiovascular system, Heart function. Flashcards
Based on your understanding of physiology from the course,
which of the following causes people to faint when they stand
up quickly? There is only ONE answer.
Blood pressure is not able to be increased quickly enough
what kind of system do humans have
closed system
what occurs if blood volume increases or if the blood vessels are constricted
blood pressure increases
where does the exchange between blood and cells take place
capilliaries
what is bulk flow
dependent on blood pressure gradient
moves from high to low
Why do some humans sometimes faint when
they stand up quickly after lying down
orthostatic hypotension
Why do ~15% of
people faint when
they see blood?
Vasovagal syncope
parasympathetic nervous system overdrives emotions decreaseing bp
what occurs when the sympathetic release of norepinephrin decreases
arterioles dilate
Giraffes are 14-18 ft tall. Humans are typically not taller than ~6 ft
tall. Predict how do you think this affects giraffe’s blood pressure in
their heads.
a. Giraffes have much lower blood pressure in their heads than
humans have in their heads
b. Giraffes have similar blood pressure in their heads to human blood
pressure in their heads
c. Giraffes have higher blood pressure in their heads compared to
human blood pressure in their heads.
b. Giraffes have similar blood pressure in their heads to human
blood pressure in their heads
. Giraffes are 14-18 ft tall. Humans are typically not taller than ~6 ft tall. Predict how do you think this affects giraffe’s blood pressure near their hearts.
a. Giraffes have much lower blood pressure near their hearts than humans have near their hearts
b. Giraffes have similar blood pressure near their hearts to human blood pressure near their hearts
c. Giraffes have higher blood pressure near their hearts compared to human blood pressure near their hearts.
c. Giraffes have higher blood pressure near their hearts compared to human blood pressure near their hearts.
what does hyptertension lead to
kidney failure, heart failure and swollen legs
what does heart failure do
heart is working too hard to pump blood so there is higher blood pressure, thickening the heart muscle making it stigger
what occurs when the kidney fails
too high of blood pressure will push the dirty blood into nehron casing damage to kidney cells
what occurs when your legs swell
high blood pressure will push water from blood to local tissure which causes swelling, it is in the leg due to gravtiy
Q6. Hypertension (high blood pressure) leads
to many complications in humans, including
heart failure, kidney failure, and swollen legs.
How have giraffes avoided these problems
despite having such high blood pressure?
a. Thin legs don’t allow for fluid build-up
b. Specific changes in genes responsible for
stiffening of the heart so that the heart
muscle doesn’t stiffen
c. Heart can pump more blood with each
stroke, leading to higher cardiac output
d. Lower filtration rates in the kidney to
counteract the high blood pressure
e. Not being affected by the influence of
gravity
a. Thin legs don’t allow for fluid build-up
b. Specific changes in genes responsible for
stiffening of the heart so that the heart
muscle doesn’t stiffen
c. Heart can pump more blood with each
stroke, leading to higher cardiac output
d. Lower filtration rates in the kidney to
counteract the high blood pressure
