April 2019 SECTION A: TRUE AND FALSE QUESTIONS (30 MARKS) STATE WHETHER THE FOLLOWING STATEMENTS ARE TRUE(T) OR FALSE (F) 1. Exocrine glands secrete products into the bloodstream. F--into ducts 2. Hormones that act on neighbouring cells are called autocrines. F--paracrine 3. Eustress is productive stress that allows the body to prepare for challenges. T--positive stress 4. Natural killer cells are classified as agranular leukocytes. T 5. Platelet derived growth factor is a local hormone that allows proliferation of of smooth muscle. T 6. Fibrinolysis refers to the dissolution (breakdown) of blood clots by plasmin. T--plasmin cut fibrin 7. The plateau phase of the formation of action potential refers to the closure of potassium ion channels. T 8. The autorhythmic characteristic of cardiac muscle cells allow it to act as pacemakers. T 9. Isovolumetric contraction refers to the right and left ventricular systole. F--atrioventricular & semilunar valves close 10. Veins convey (tras...