Cardiovascular System

    Cardiovascular System
    A drug, such as cocaine, which stimulates the heart but does directly inhibit the heart’s ability to relax, would be considered a:
    Sympathomimetic drugs are stimulant compounds which mimic the effects of agonists of the sympathetic nervous system such as epinephrine (adrenaline) and norepinephrine (noradrenaline), that is, they cause the heart to beat faster. A sympatholytic (or sympathoplegic) drug is a medication which inhibits the functioning of the sympathetic nervous system. The choices C and D refer to slowing down the heart.
    Author: rikazzz Comment
    Cardiovascular System
    How may the transfusion reaction that results from infusion with incompatible blood be described?
    Antigens are on the plasma membrane of RBC; antibodies are in the plasma. Antibodies attack antigens. While choice B can happen, it does not cause problems.
    Author: rikazzz Comment
    Cardiovascular System
    Which of the following is a difference between cardiac muscle and skeletal muscle?
    Cardiac muscle cells have branches, but skeletal muscle cells are single fibres.
    Author: rikazzz Comment
    Cardiovascular System
    What is the outermost layer of the heart wall known as?
    “Epi-” refers to “on top of”. It is the visceral part of the pericardium.
    Author: rikazzz Comment
    Cardiovascular System
    The kinetic molecular theory of gases provides us with some valuable insights into the behaviour of gases. One correct prediction of the theory is that gas pressure is:
    Gas molecules exert a force on walls as they bounce off. Gas pressure may be understood as the cumulative effect of the force exerted by millions of particles, divided by the area of the walls.
    Author: rikazzz Comment
    Cardiovascular System
    Which of the following formed elements of the blood is important in the formation of clots?
    Thrombocytes (platelets) are attracted by chemicals released by damaged endothelial cells and in turn release substances which cause other platelets to aggregate to form a platelet plug to cover the hole.
    Author: rikazzz Comment
    Cardiovascular System
    An intravenous (IV) infusion flows into a vein because of hydrostatic pressure. This depends LEAST on which of the following?
    Gravity acting on the head of liquid provides the pressure that forces an IV solution into a vein. As long as the head of liquid is maintained, the volume contained in the IV bag has little influence.
    Author: rikazzz Comment
    Cardiovascular System
    Which of the following statements about the cardiovascular control centre of the brain is TRUE?
    Impulses travelling in the sympathetic fibres increase heart rate (in preparation for increased physical activity).
    Author: rikazzz Comment
    Cardiovascular System
    A person whose blood group is “B positive” has which of the following?
    “B+” means having the B antigen on RBC and being positive (i.e. having) the D antigen on the RBC as well.
    Author: rikazzz Comment
    Cardiovascular System
    What is the major task of red blood cells?
    Red blood cells contain much haemoglobin which binds to oxygen to transport it to the tissues.
    Author: rikazzz Comment