Module 7

• 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