Question

sit in a chair, stand up, and walk across the room

(if you can't walk, how do you get across the room? what are the steps?)

Write a how to manual about what needs to happen in our bodies for this to take place? It might seem as simple as above, but it is not. What muscles are involved? How do the muscles communicate with the brain? This exercise is to make you start to think about everything that must happen to sit in a chair, stand up, and walk across the room. Sit a chair, stand up and feel what is happening... and write it down! turn in your how to manual. Tinhis is something you could write a novel about. Limit your time on this activity to 15 minutes.

Answer 1

A) To SIT in a chair following muscles are involved -

1. Quadriceps femoris is contracted

2. Hamstrings shorten and their angle changes

3.iliopsoas angle also changes .

B) SITTING TO STANDING -

MUSCLES:

Hip extension by hamstrings and glutes

Back extension by paraspinalis and erector spinae

Knee extension by rectus femoris and quadriceps femoris.

JOINTS:

Sarcoiliac joint for hip stabilization

Anterior cruciate ligament, posterior cruciate ligament , lateral and medial ligaments of knee joint that prevent prevent lateral or medial deviation of foot .

NERVES:

Femoral ,tibial,deep peroneal,common peroneal nerves are involved.

WALKING -

Involves 5 stages -

Heel strike:

The foot touches the ground first

Gluteus maximus- acts on hip for forward motion of lower limb

Quadriceps femoris- keeps the leg extended at knee and thigh flexed at hip

Anterior compartment of leg- dorsiflexion of ankle is maintained by this compartment.

Support :

The whole foot rests on ground

Inverters and everters- contract in balanced manner to stabilise the foot.

Quadriceps femoris- accepts the body weight by extension of thigh.

Gluteus medius,minimus and tensor fascia lata-They counteract the imbalance created from having most of the body weight on 1 leg by contacting.

Toe off :

Where the toes are on ground

Posterior compartment of leg- plantar flexion of ankle by soleus ,gastrocnemius and tibialis posterior.

Leg lift-

Leg has left the ground

Hamstrings

Anterior compartment of leg- dorsiflexion at ankle

Rectus femoris and iliopsoas.

Swing -

The raised leg is moved forwards

Iliopsoas and rectus femoris

Quadriceps femoris

Anterior compartment of leg- maintains dorsiflexion of ankle

C) HOW MUSCLES INTERACT WITH BRAIN :

Brain connects with muscles only by motor neurons of the spinal cordWhen brain sends motor impulse through these motor neurons chemical mediators are released at the endings.They cause the muscle to contract which makes them shorter.