Cardiovascular System

    Cardiovascular System
    What will be the partial pressure of oxygen in a hyperbaric chamber where the atmosphere contains 30% oxygen and is at a pressure of three atmospheres (300 kPa)?
    The partial pressure of oxygen is proportional to its percent concentration in the mixture of gases. 30% of 300 kPa = 90 kPa.
    Author: rikazzz Comment
    Cardiovascular System
    Which of the following statements about resting blood pressure is correct? According to the Australian Heart Foundation Classifications:
    If resting systolic BP is above 140 mmHg and diastolic BP is above 90 mmHg, then a diagnosis of hypertension may be made. Choice A is very high BP.
    Author: rikazzz Comment
    Cardiovascular System
    A systolic blood pressure which is stated as 16 kPa (120 mm Hg) means that the pressure in the arterial blood is:
    The pressure exerted by the atmosphere is disregarded when reading the pressure on the gauge. 16 kPa actually means that blood is actually at a pressure of 16 + 101 kPa.
    Author: rikazzz Comment
    Cardiovascular System
    Different types of capillaries are distinguished by their structure. Which of the following is NOT a structural difference between capillaries?
    No capillaries “start” in the tissues. Continuous capillaries are joined by tight junctions, fenestrated capillaries have pores and sinusoid capillaries may have no basement membrane.
    Author: rikazzz Comment
    Cardiovascular System
    Careful blood matching is performed prior to transfusing blood in order to avoid which scenario?
    If the recipient’s antibodies attack the donated RBC, agglutination will occur. The reverse (choice D) is not a problem.
    Author: rikazzz Comment
    Cardiovascular System
    Finish the sentence correctly. Plasma proteins:
    Plasma proteins are responsible for colloid osmotic pressure. Serum does not include clotting factors – since fibrinogen is a clotting factor and a plasma protein, choice D is incorrect.
    Author: rikazzz Comment
    Cardiovascular System
    Blood osmolarity is about 290 mosmol/L. What would happen to red blood cells if they were placed in a solution of 180 mosmol/L?
    A solution of 180 mosmol/L is hypotonic, so osmosis would occur, moving water into the RBC. Consequently they would swell and many would lyse (split open). Haemolysis would occur.
    Author: rikazzz Comment
    Cardiovascular System
    Which blood vessel supplies oxygenated blood to the liver?
    The term hepatic refers to the liver. Arteries supply oxygenated blood (except for the pulmonary artery).
    Author: rikazzz Comment
    Cardiovascular System
    Increasing the number of red cells per millilitre of blood will:
    Increasing the number of RBC would increase blood viscosity, and if viscosity increases, then the rate of flow would decrease (Poiseuille’s law).
    Author: rikazzz Comment
    Cardiovascular System
    What type of blood may a patient with blood type “B+” be infused with? Any blood that is
    A patient that is B+ may receive B+, B−, O+ or O− blood because those types do not have antigen A on the donated RBC.
    Author: rikazzz Comment