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2nd Year: 2nd Sem
Histology Lab
Module 7
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Circulatory system is also known as what?
Cardiovascular system
What are the components of the circulatory system?
Heart
,
arteries
,
capillaries
, and
veins
Heart
: pumps the blood through the
ARTERIAL SYSTEM
under significant
PRESSURE.
Blood vessels are arranged so that blood delivered from the
HEART
quickly reaches a network of narrow and thin-walled vessels called
CAPILLARIES.
What are the layers that surround each chambers of the heart?
Epicardium
,
myocardium
, and
endocardium
What is the visceral layer of the serous pericardium?
Epicardium
What layer of the heart adheres to the outer surface of the heart?
Epicardium
What layer of the heart consists of BLOOD VESSELS and NERVES?
Epicardium
What type of epithelial tissues does the EPICARDIUM has?
Simple squamous mesothelium
The simple squamous mesothelium of the epicardium is supported by a layer of what?
Loose connective tissue
Epicardium contains
ADIPOSE TISSUE
and
LUBRICANT FLUID.
Pericardial fluid
: prevents friction from PERICARDIUM.
What is the thickest layer of the heart?
Myocardium
Myocardium
is the thickest layer because
STRONG FORCE
is needed to pump the blood
What type of muscle does myocardium has?
Cardiac muscle
The myocardium is thicker in the walls of what chamber?
Left ventricle
What is the INNERMOST LAYER of the heart?
Endocardium
Endocardium consists of what?
Lining endothelium
,
connective
and
smooth muscle
Which layer of the heart comprise of the heart's IMPULSE CONDUCTING SYSTEM?
Endocardium
The walls of BLOOD VESSELS except what contain
SMOOTH MUSCLE
and
CONNECTIVE TISSUE
in addition to
ENDOTHELIAL LINING
?
Capillaries
What do you call the specialized epithelium that acts as SEMIPERMEABLE BARRIER between 2 major internal components?
Endothelium
The endothelium separates what two components?
Blood
and
interstitial
issue
What is the outermost layer of blood vessels?
Tunica adventitia
Which layer of the blood vessel composed of LONGITUDINALLY ORIENTED COLLAGEN and ELASTIC CONNECTIVE TISSUE FIBERS?
Tunica adventitia
Tunica adventitia consists primarily of what type of collagen?
Type I collagen
What is the MIDDLE LAYER of the blood vessels?
Tunica media
Which layer of the blood vessels consist of CHIEFLY concentric layers of HELICALLY arranged SMOOTH MUSCLE FIBERS?
Tunica media
What layer of the blood vessels is the INNERMOST?
Tunica intima
What layer of the blood vessels faces the lumen?
Tunica intima
What layer of the blood vessels consist of the ENDOTHELIUM and a THIN LOOSE CONNECTIVE TISSUE?
Tunica intima
What does VASA VASORUM literally means?
Vessel of the vessel
Vasa vasorum
: system of vessels that supplies BLOOD to the vascular walls themselves
Vasa vasorum is more EXTENSIVE in walls of what type of blood vessels?
Veins
Vasa vasorum is more extensive in walls of veins than arteries due to
POOR OXYGEN
content of veins.
Nervi vasorum
: network of AUTONOMIC NERVES that control contraction of the SMOOTH MUSCLE in the vessel walls
In the AORTA, which layer of blood vessels REMAIN UNSTAINED?
Tunica intima
In the AORTA, which layer of blood vessels contains MORE ELASTIC FIBERS than smooth muscle?
Tunica media
In the AORTA, which layer of blood vessels occupies MOST of the vessel wall?
Tunica media
In the AORTA, which layer of blood vessels is LESS STAINED and has a narrow peripheral zone of CT?
Tunica adventitia
In the TUNICA MEDIA of the Aorta, which is DARK?
Elastic fiber
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