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Lecture 3

BIOL 1011 Lecture Notes - Lecture 3: Capillary, Arteriole, White Blood Cell

Course Code
BIOL 1011
Marty Leonard

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Lecture 3 – Dr. Marty Leonard Thursday, February 13 th
, 2014
Circulation & Gas Exchange
Part 1: Circulation
Heart - made up of cardiac muscle, found under the breastbone containing four chambers
1. Atria – receive blood
2. Ventricles – pump blood
Oxygen-rich blood that has already been to the lungs are kept on the left.
Oxygen-poor blood is kept on the right.
The Mammalian Heart
Typically, oxygen poor blood is displayed in blue
Right hand side (oxygen poor blood)
Inferior or superior vena cava
These two veins empty into the right atrium

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Then, goes to right ventricles and it’s pumped up out of the heart through two pulmonary arteries
In the lung, carbon dioxide is given off and exhaled
Oxygen which you inhale is going to be picked up by the blood
Atria have fairly thin walls. Ventricles have to pump blood so they tend to have thicker muscles. The right ventricle
is a bit thinner than the left ventricle (because it only has to pump blood to the lungs). Thickness of the muscle
related to job the chambers have to do.
Heart Valves
What keeps the blood flowing in the correct direction through the heart
These valves are made up of connective tissue
1. Atrioventricular valves
Located between right atrium and right ventricle
Prevent blood from going ventricles back up into atria
When the ventricles contract, they close their valves
2. Semilunar valves
At the exits
Located between the right ventricle and pulmonary arteries
Also, located between left ventricle and aorta
The sound of blood hitting those closed atrial ventricular
If you have a heart murmur,
Blood Vessels

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Three different types of blood vessels:
Arteries (arterioles)
oVessels that carry blood away from the heart
oWhen arteries hit organs, they subdivide into smaller vessels called arterioles
Veins (venules)
oCarry blood to the heart
oSmaller versions of veins referred to as venules
oThin vessels throughout the body that __________
oInfiltrate all the tissues of the body
oForm networks called capillary beds
oAlways very close to cells
Heart Arteries  Arterioles  Capillaries
Venules  Veins  Heart
Structure of Blood Vessels
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