The Muscular System is one of my favorites because of the fact that is, with the skeletal system, the basic external appearance of us. 
We learn about the basic anatomy of our body, with the different names of the muscles and the classification depending of shape, size or action. Also the fact that our muscles work in opposing pairs, when one contracts the opposite relaxes. 
We verified it in the Chicken Lab where we saw the different opposite muscles as the biceps brachii and the triceps brachii.

We learned the different synovial joint's movement by doing a dance where we used different parts of the body and different positions of the muscles. 
There are different movements such as rotation (when you move your head side to side) or, depression (when you open you mouth and elevation when you close).


Also we learn about the muscle contraction that is divided into different steps:

  1. Motor neuron sends action potential (nerve impulse) to the muscle.
  2. Acetylcholine released from vesicles on motor neuron.
  3. Ach binds to receptors on muscle membrane and activates 2nd action potential, now on muscle.
  4. Action potentials opens active transport pumps of sarcoplasmic reticulum.
  5. Ca2+ floods sarcoplasm, AChE degrades Ach.
  6. Ca2+ attaches to troponin of TT complex and changes in shape.
  7. This shape change pulls tropomyosin away from myosin-binding sites on actin.
  8. ATP attaches to ATP binding site on myosin crossbridge.
  9. ATPase on myosin head in presence of Mg+ splits ATP into ADP+P which energizes myosin head (swings forward)
  10. P flies off and myosin head binds to binding site on actin.
  11. ADP is pushed off and myosin head is de-energized (pulling actin forward) now myosin swivels back to resting state.
  12. REPEAT steps 8-11 until Ca2+ comes off the TT complex.
We have learnt a lot during this unit and I think that it helped me to decided what do I want to specifically in my future career.
Also as a student I think that I have grown because each time I'm more interested in all the work that we do, so I do all the activities with more enthusiastic.