D.
I hope this helps and have a wonderful day filled with joy!!
<3
Having both normal, circular red blood cells and sickle shaped red blood cells in his or her circulatory system.
hope this helped :)
I would say it would respond w/ it hurting and your gasping for air because when you run for a long periods of time u get a pain that hurt from running so much and because your dehydrated and ran out of breath
The contractile units of skeletal muscles are myofibrils. Thus,option A is correct.
<h3>What is skeletal muscles?</h3>
Skeletal muscles are 32 to 40% of total body mass. The type of muscles that connect to bones and allow to perform a wide range of movements and functions.
Skeletal muscles are easily controlled and work according to the desire .
Skeletal muscles are specialized tissue that is connected to bones and allows movement.
Therefore, the contractile units of skeletal muscles are myofibrils. Thus option 1st is correct.
Learn more about myofibrils here:
brainly.com/question/1194286
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