Cardiovascular System

    Cardiovascular System
    Which blood cell fits the following description: multilobed nucleus, inconspicuous cytoplasmic granules and most common type of blood cell except for red blood cells?
    Neutrophils are the most common WBC and have a large multilobed nucleus.
    Author: rikazzz Comment
    Cardiovascular System
    What can be said about a person who has the “A” antigen on their red blood cells?
    Their blood contains anti-B agglutinins. If you have the A antigen on your RBC, you cannot have the anti-A agglutinin in your plasma or you would agglutinate your own blood.
    Author: rikazzz Comment
    Cardiovascular System
    Which statement about neutrophils is correct?
    Neutrophils do have a nucleus but don’t have haemoglobin. Eosinophils are a type of WBC as are neutrophils, but they are not the same.
    Author: rikazzz Comment
    Cardiovascular System
    Choose the structure known as the pacemaker of the heart from the following.
    The SA node in the right atrial wall sets the pace of the heart rate.
    Author: rikazzz Comment
    Cardiovascular System
    Using “suction” to drain fluid is described correctly by which choice below? Creating a:
    Fluids will flow towards the lower pressure, so creating a pressure below atmospheric pressure will cause fluid to be pushed by atmospheric pressure towards the negative pressure.
    Author: rikazzz Comment
    Cardiovascular System
    Which blood vessels allow blood to leave the heart and which allow blood to enter the heart?
    The aorta and pulmonary trunk carry blood away from the LV and RV (respectively), while the two venae cavae and four pulmonary veins bring blood into the RA and LA, respectively.
    Author: rikazzz Comment
    Cardiovascular System
    By which means will the sympathetic response raise blood pressure?
    The neurotransmitter epinephrine will attach to the alpha receptor sites of smooth muscle in blood vessels and cause vasoconstriction (except for blood vessel in skeletal muscle). Choices C and D are wrong as beta, not alpha, receptors increase CO. Choice B is wrong as alpha (not beta) receptors produce vasoconstriction.
    Author: rikazzz Comment
    Cardiovascular System
    Capillaries permit the exchange of nutrients and wastes between cells and the blood because of which feature of their structure?
    The walls of capillaries are very thin and have only one tunic, not three in their wall.
    Author: rikazzz Comment
    Cardiovascular System
    Through which valve does blood flow when it moves from the left atrium into the left ventricle?
    The left atrioventricular valve is also known as the mitral (and bicuspid) valve.
    Author: rikazzz Comment
    Cardiovascular System
    Consider Boyle’s law. If the pressure being exerted on an enclosed volume of gas (at a constant temperature) is increased by 20%, by what percentage would its volume change?
    Pressure and volume are inversely proportional. So if P increases by 20%, V will decrease by 20%.
    Author: rikazzz Comment