Answer:
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.
There are two basic types of ER. Both rough ER and smooth ER have the same types of membranes but they have different shapes. Rough ER looks like sheets or disks of bumpy membranes while smooth ER looks more like tubes. Rough ER is called rough because it has ribosomes attached to its surface.
<span>The double membranes of smooth and rough ER form sacs called </span>cisternae. Protein molecules are synthesized and collected in the cisternal space/lumen<span>. When enough proteins have been synthesized, they collect and are pinched off in </span>vesicles<span>. The vesicles often move to the Golgi apparatus for additional protein packaging and distribution. </span>
Smooth ER (SER)<span> acts as a storage organelle. It is important in the creation and storage of lipids and </span>steroids<span>. Steroids are a type of ringed organic molecule used for many purposes in an organism. They are not always about building the muscle mass of a weight lifter. Cells in your body that release oils also have more SER than most cells. </span><span>
God Bless:)</span>
Concerning your heart, that's the circulatory system
Your lungs are the respritaory system
So we all know that the Earth rotates around the Solar system all the time nonstop. But wait there is more. One half of the Earth which is North America and South America are faced to the sun so you can tell that we are in summer. While we are in summer,the other half of the Earth which is Europe,Africa,Asia and Austrialia ( I think I spelled that wrong who cares about that) they are in winter. This process continues nonstop there is no break.
