Emails between CDC and Facebook, obtained on behalf of @ICANdecide, show CDC guiding FB's messaging. For example, CDC tells FB the "focused messaging for the next week" includes "Rethink travel, gather virtually, wear a mask" followed by patriotic slogans. https://t.co/A6u1MWLuHW
Leaked emails between the CDC and Facebook show the CDC guiding Facebook’s messaging “focused messaging,” recommending patriotic “Messages of duty e.g., ‘For your family, for your country.’” https://t.co/loPRRd9ftE
Arteries: blood vessels that carry
blood away from the heart to tissues.
Veins: blood vessels that carry blood back to the heart from the tissues.
SIMILARITIES BETWEEN VEINS & ARTERIES
Both have three
layers of tissues in their walls: 1) a hollow lumen to allow the flow of blood without
any hindrance, distribution into deep tissues of the body, having branches,
etc.
Main differences between
arteries and veins
Arteries and veins are two similar yet different types of
blood vessels that make up the circulatory or vascular system.
DIFFERENCES IN STRUCTURE & FUNCTION
Arteries carry away the blood
pumped by the heart during systole.
Veins carry blood from the periphery of
the body back to the heart.
From the heart, arteries start from the aorta,
which branches out as arterioles.
Capillaries are so minute that they pass in
between cells and deeper into most parts of tissues. They supply the blood
containing oxygen and nutrients to each cell and tissue.
As seen in the image above, capillaries
extend to converge into veins. They collect the waste and carbon dioxide from
the cells and tissue surroundings to bring into the blood for excretion.
Capillaries then converge to form a few
venues that are a bit bigger in size.
VENULES
Venules further converge to form veins.
These veins further converge to form the
superior and inferior vena cava.
VEINS POUR DEOXYGENATED BLOOD INTO THE HEART
Larger veins pour deoxygenated blood that has collected into the heart.
DEOXYGENATED BLOOD: FROM HEART TO LUNGS
The heart sends the deoxygenated blood to the
lungs through the pulmonary artery.
OXYGENATED BLOOD: FROM LUNGS TO ARTERIES
And the oxygenated blood received through
the pulmonary veins from the lungs is pumped into the arteries.
Arteries carry pure blood from the heart
to the tissues while the veins return impure blood. But there
are a few interesting exceptions to this rule.
A pulmonary vein brings pure oxygenated blood
from the lungs into the heart.
While a pulmonary artery carries impure blood
(carbonated) from the heart to the lungs, so these two are different from the
rest of the blood veins and arteries only in terms of function.
Besides, there are also anatomical structural
differences between them. These differences are meant to keep them safe,
perform their function efficiently, and also to minimize the workload on the
heart. Further, the energy requirement of the body to circulate the blood is
minimized.
ANATOMY & STRUCTURE OF ARTERIES & VEINS
ARTERIES: CARRY BLOOD FROM THE HEART TO THE REST OF THE BODY
Arteries are thickly walled and located deeper in the body. They're highly elastic due to circular and oblique muscles
in their walls. This elasticity helps to convey the pulse from the heart until
the blood reaches the cells and tissues.
The blood in the arteries flows due to the
pressure from the heart contraction. Hence, you can notice pulse in the
arteries but not in veins. Even a physician checks your pulse rate by holding
the arteries of the wrists or carotid artery in the neck.
The blood in arteries is reddish-brown and
enriched with oxygen and nutrients.
VEINS: CARRY IMPURE BLOOD BACK TO THE HEART
These are thin-walled blood vessels located
superficially in the body. Hence, you can see dark-colored veins below the skin
in the arms, hands, thighs, etc. The blood flows in them under the influence of
capillary action. In humans, this blood flows against the gravitation force.
So to prevent backflow, there are valves in
the inner walls. These valves close down when the blood tends to flow
downwards. Hence, the blood always moves in one direction in veins in-spite of
lack of pulse.
The blood in the veins is bluish red and has a
high concentration of carbon dioxide, urea, and other excretory waste.
Arteries receive blood due to pressure from
the heart, while veins do not have that pressure.
ARTERY THICKNESS
As seen in the differences above, arteries
have thick walls as they have to bear the systolic pressure. Also, they have
more muscle mass in the walls to propagate the pulse further due to elasticity.
This helps the blood move fast in the vessel
to the tissues. Hence we can measure heart pulse from the wrist artery. A
further thick wall may minimize the chances of oxygen and nutrients to diffuse
to the surroundings.
LOCATION OF ARTERIES IN THE BODY
Their deep-seated location in the body may
also be to prevent damage to them in injury to the body.
As their damage can destroy the organ receiving the blood faster.
But for veins, there is another alternative called lymph vessels, which also
carry waste from tissues. So damage can to them can be less severe.
The only condition is there should be no
hemorrhage.
PRESSURE & BLOOD FLOW: THE HEART PUMPS BLOOD THRU THE ARTERIES; CAPILLARIES PUMP BLOOD THROUGH THE VEINS
The pressure exerted by the blood on the walls
of the arteries is higher than that of the veins because the blood
flows in the arteries due to the pumping action of the heart.
This pumping action forces the blood to flow
with speed leading to pressure in the arterial wall.
Whereas in the veins, the flow is due to
capillary forces between the vein walls and the blood.
Hence, blood pressure is monitored for the
arteries and not the veins.
VALUE OF VALVES
Valves help in preventing the blood from
flowing backward in the veins. The blood flows against gravity due to capillary
action.
Since there is a change in gravitational
pressure when sitting and standing up, there is a chance of variation in the
flow pressure.
So valves prevent the backflow of blood in
veins. This is not required in arteries.
COLOR
The arteries are dark reddish due to
oxygenated blood. While for veins, bluish-red is due to oxygenated blood.
DISEASE
Arteries are thick and carry nutrition. So,
nutrition-born disease occurs due to the accumulation of fat. While for veins,
it is rare but occurs due to obstruction or physical damage to them.
Just because a food is "real," doesn't mean that it is
fit for human consumption. Grains, for example, are real food, but they
cause weight gain. Weight gain means mild, imperceptible
inflammation. Can you think of a food high in the glycemic index that
could be good for you and it might be good for you? A baked potato.
Because it goes from ground to dinner plate with minimal, if any,
processing. Compare that to grains like wheat, corn, rice, barley, and
others. I get it, a potato is a tuber that grows below ground. So
real food is no guarantee of health. A lot of "real food"
articles like to add pictures of a grocer's produce section--green leafy
vegetables, colorful bell peppers, dark-colored berries, and tubers. Plant
foods are referred to as phytonutrients. Phytic acid, an indigestible
compound in vegetables and fruits, interferes with other nutrient
absorption. This can ve beneficial or it can interfere. Interfering can
have benefits, like when the phytic acid chelates the excess, unbound iron
floating in your blood. So, to point to "real food" is more a
marketing gimmick than it is really good advice. It just strikes the
surface.
“Real food is anything that came out of the ground or from animals that ate anything that came out of the ground,” said Dr. Robert Lustig of @UCSF.
What, Harvard couldn't tolerate scientists with integrity?
Why did Dr. Martin Kulldorff part ways with Harvard with >200 publications+FDA stellar record. I have > 650 papers and together we surpass any of those on the govt narrative. Because we both know something has gone very wrong in med school + MSM portrayal of pandemic response. pic.twitter.com/0TKtW90CFP
