You are a graduate student working with isolated aortic rings in a muscle bath. you measure vessel contraction (force in mn) in response to compounds that are thought to bind to g protein coupled receptors. when you expose aortic rings to drug x alone you get no response. when you expose the aorta to drug y alone the vessel contracts generating a force of 17mn. when you expose the aorta to drugs x and y together the aorta contracts more than with drug y alone and generates a force of 24mn.

where on the receptor does drug x bind?

where on the receptor does drug y bind?

explain why drugs x and y have an additive effect.

Explanation:

a) Drug X binds to the secondary site or co-agonist site of the receptor since it has no effect on contraction.

b) Drug Y binds to the primary site or agonist site of the receptor since it elicits contraction when aorta is exposed to it.  

c) Drugs X and Y have a synergistic effect because the sum of their forces measured independently is larger than when they are tested simultaneously.

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .

after making a punnet square using bv bv bv bv you will find that the ratio will be 9: 7 or a 128.6% probability.

hope this