Reema wished to be a participant in the Annual Sports Day. After she took part in athletics for the sports selection, she suffered severe muscular pain. a) Why did Reema get a muscular cramp after running?
b) Which type of respiration took place in her muscle cells while
running? Suggest a way for Reema to overcome her pain.

Hey there mate ;)

According to questions:-

(i) Reema got muscular cramps because excessive anaerobic respiration has taken place. Since she took part in athletics, her legs had to run as fast as possible. which means that her heart beat rate became faster. Therefore, lactic acid along with other substances was formed in her legs.

(ii) During Reema's running, anaerobic respiration took place. In order to relieve her pain, she can do three main steps :-

★ Reema can take a hot shower, which can help her with her tight legs.

★ She also can apply warm towel to increase the flow of blood in her legs again.

★ Or else, Reema can be given a massage, which is the easiest and most accurate option.

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!

is it multiple choice?