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Lecture 4

BIOM2000 Lecture 4: Unit 4 BIOM2000

Biomedical Sciences
Course Code
BIOM 2000

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Physiology — Unit 4
Identify components of circulatory system
Differentiate between vascular + circulatory systems
Describe flow of blood through heart
Discuss importance of 2 circulation systems
Explain how blood pressure is regulated
Discuss capillary exchange + identify role of lymphatic system in
List components of blood
Components of Circulatory System:
Circulatory system consists of 3 parts:
1) a pump (the heart)
2) carrying vessels (arteries, arterioles, venules + veins)
3) networks of small
beds w/in which
transfer of
materials between
blood and body
cells occurs
When it comes to
the heart, it is a
combo of 2
muscular pumps,
the left and right
side of the heart —
each with an upper
chamber (atrium)
and a lower
chamber (ventricle)

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Chambers of the Heart:
The atria have thin walls compared to walls of ventricles
Wall of left ventricle — also thicker than right ventricle (shown in figure
Atria referred to as receiving chambers, while ventricles are responsible
for ejecting blood and are referred to as discharging chambers
Explains difference in wall thickness between atria + ventricles
Imagine blood eventually needs to be pumped against gravity from
ventricles out of heart via vessels
The reason that left ventricle is thicker than right is related to path that
blood takes after leaving heart

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Pathway of Blood Flow:
General pathway of blood flow thru heart involves blood moving from
major veins into atria
Contraction of atrial muscle forces blood into ventricles + contraction of
ventricular muscle forces the blood into major arteries that lead away from
Blood flow is a close circuit that flows in one direction, so you can start
from anywhere when looking at diagrams
Summary of heart during cardiac cycle…
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