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The figure below shows a model which was used by a group of Form 2 students to show the effect of or action of intercostal...

      

The figure below shows a model which was used by a group of Form 2 students to show the effect of or action of intercostal muscles on the movement of ribs.

strings.png

(a) How does the sternum move when;
(i) String A is pulled tight.

(ii) String B is pulled tight.

(b) Between string A and B, which one represents;

(i) External intercostal muscles?

(ii) Internal intercostal muscles?

(c) What does structure Q represent in an animal

  

Answers


Martin
a i)Moves upwards and inwards (towards Q);

ii)Moves downwards and (away from Q);

b i)String B;

ii)String A;

c Vertebral column;
marto answered the question on September 25, 2019 at 08:46


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