1) Detail the complete reflex pathway involving parasympatheticsignalling to the heart. Begin this at the carotid bodybaroreceptors.

( 2) Explain why the M2 subtype of muscarinic ACh receptors isfound on the autorhythmic cells of the sinoatrial node and the M3subtype is found on smooth muscle fibers of the bronchioles.

3) Skeletal muscle has a defined contraction period, causing thefull contraction of every stimulated fiber. Part 1 - Whatdetermines the length of time during which the fiber contracts?Part 2 - What ends the contraction, so relaxation can begin? (notincluding the termination of the NMJ stimulation) Part 3 - Takingthe previous two parts, and now adding in that the NMJ has stoppedinducing depolarizations at the motor end plate, describe theevents as the contraction cycle (each single twitch) ends. Part 4 -Taking the previous three parts, and now adding in that the NMJcontinues to induce depolarizations at the motor end plate, explainthe generation of increased muscle tension as summation occurs. 4)Using the following table for reference, explain eachcharacteristic, especially noting the differences between fibertypes within a given characteristic, and what that means to thefiber type. This of course requires you to relate the