Question

hat is the best description of pulmonary blood flow? A) low flow, high pressure C) high flow, low pressure B) low flow, low pressure D) high flow, high pressure Vhich of the following is the skeletal muscle reflex responsible for preventing excessive tension in the uscle due to overcontraction? A) joint capsule receptors C) Golgi tendon organs B) muscle spindle fibers D) autonomic reflex Vhich of the following stimulates the cells of the adrenal medulla to secrete its excitatory hormones? B) preganglionic parasympathetic neurons A) postganglionic sympathetic neurons C) preganglionic sympathetic neurons D) postganglionic parasympathetic neurons of the following directly require ATP in skeletal muscle contraction? (Choose all that apply) A) Return of Cat+ to the SR B) Shifting of tropomyosin by troponin C) Binding Ca+ to the sarcomere D) Restoring membrane potentials back to resting potentials E) Activation of the DHP receptor F) Release of myosin head from actin G) Release of tropomyosin blocking troponin H) Release of Ca++ from SR Which Why does the cardiac contractile cell action potential have a plateau phase? A) Ca2+ entry into sarcoplasm matches the amount of Kt leaving B) Nat channels open and flood the cell with Na+ during the action potential C) If channels open earlier than in other cells, causing the Cat+ to open earlier D) K+ repolarizing channels open early and force the return of the membrane potential to resti

Answer 1

Q.1. Option C is coorect regarding the pulmonary blood flow i.e high flow, low pressure system

Q.2. the option C is correct as its the Golgi tendon apparatus that is responsible for preventing extensive teension in the muscle due to over contraction

Q.3. Option A is coorect as the postgangionic sympatehetic neurons stimulates the cells of adrenal meddula to secreate excitatory hormone

Q.4. all are required

Q.5. Option D is correct as at the end its the inward potassium current produces repolarization in the last phase