Cardiovascular system Flashcards
The thick tunica media of muscular arteries and decreased quantity of elastic fibres limits what ability?
Their ability to expand
What are collateral arterial branches?
Branches that arise from the side of the main blood vessel
Briefly describe the role of the urinary system in the circulatory system
Delivers 20% of resting circulation to kidneys for filtering, reabsorption of useful products, and seretion of excesses - regulates blood volume and pressure by regulating fluid loss in the form of urine and by releasing the enzyme renin that is essential in the RAAS mechanism
A typical heart is approximately ____cm wide
8cm
Which arteries have a higher percentage of elastic fibres in all three tunics? What is the name for these vessels?
Those closest to the heart - they are known as elastic arteries
The posterior surface of the heart lies near the bodies of the ____.
Vertebrae
What kind of artery are the aortic collateral branches?
Elastic artery
From what does a macrophage develop?
A monocyte that has left circulation
The weight of a female heart is approximately ____ to ____ grams
250 - 300
Where do T lymphocytes mature?
Thymus
Name the single vessel that exits the right ventricle
Pulmonary trunk
Erythrocytes pick up approximately ____% of carbon dioxide waste at the tissues to transport to the lungs for exhalation
24%
Paired vertebral arteries join together to form the large basiliar artery at the base of which structure?
Medulla oblongata
What is the effect of veins having a larger diameter of the lumina?
More blood can flow with less vessel resistance
Do the chemicals released by basophils contribute to or inhibit inflammation?
Contribute, through the release of histamine
Name the two ‘great arteries’
Aorta and pulmonary trunk
What is a product/function of capillaries being extremely narrow in diameter?
It slows the passage of erythrocytes and extends the window of opportunity for gas exchange to occur
What percentage of leukocytes are made up of monocytes?
2 - 8%
Where are continuous capillaries found?
Almost all vascularised tissues
Some therapies are now using infusions of concentrated ____ to stimulate healing.
Platelets
Why are a third of platelets stored in the spleen?
They are released in response to blood vessel rupture
The inferior vena cava parallels the ____ ____.
Abdominal aorta
The diameter of muscular arteries typically ranges from ____mm to ____mm
0.1mm to 10mm
To what do coronary arteries supply blood?
The myocardium and other components of the heart