Answer: D. Contractility of the heart muscle refers to the force of contraction that this muscle can exert.
Explanation:
The myocardial contractility is ability of the heart muscles to contract. This is achieved by the forces which develop between the contracting muscles caused by the filaments of actin and myosin.
The degree of binding of the muscle filaments dependents upon the calcium ion concentration. These actions are controlled in vivo by the sympathetic nervous system. It is driven by the release of the catecholamine, which is a process which determines the calcium ion concentration inside the cytosol of the muscles of the heart.
The original weight is 4.
Explanation:
20%= 1/5 if u don’t know the percentage then u can simply by doing..
20/100 then u divide it. U can do this by any other numbers such as 2, 4,5,10 and 20. U can do which ever way u like but i would recommend doing it either by 10 or 20.
So if we divide it by 20 we do...
20/100 divided by 20= 1/5
Or
20/100 divided by 10= 2/10
2/10 divided by 2 = 1/5
You can see the bigger the number that fits in is faster, although u can do it any way u feel like doing.
So we have got 1/5 from 20%. Now we do...
1/5 divided by 20. So when we do this, we use the bottom number to divide it and the top number to times it.
So..
1/5 u could use as 20 divided by 5..
Then 1 times the number that u get from ur before sum.
The answer is 4.
Because 1/5= 20 divided by 5 = 4
Since we have a 1 left we do..
4 times 1 which is... 4.
( u don’t need to show these parts in doing ur working, but i am doing these so they can help u understand)
So the answer is 4 and is the original weight.
I hope this is clear and helps u! :D
Wow I didn’t know that:0 but if you have any questions I would be happy to answer them:)
Answer: In the case of antibiotic resistance, antibiotics cause a selective pressure by killing susceptible bacteria, allowing antibiotic-resistant bacteria to survive and multiply. Selection pressure can be regarded as a force that causes a particular organism to evolve in a certain direction.
Explanation:
