MCQ: Body Movements - UPSC MCQ

There are 206 bones in the human skeleton system in all adult human beings including:
Skull – including the jaw bone
Spine – cervical, thoracic and lumbar vertebrae, sacrum and tailbone (coccyx)
Chest – ribs and breastbone (sternum)
Arms – shoulder blade (scapula), collar bone (clavicle), humerus, radius and ulna
Hands – wrist bones (carpals), metacarpals and phalanges
Pelvis – hip bones
Legs – thigh bone (femur), kneecap (patella), shin bone (tibia) and fibula
Feet – tarsals, metatarsals and phalanges.

• The ball and socket joint, the bones can be turned in any direction i.e. forward and backward, side to side and even rotated.
• The ball and socket joints occur at the shoulder and hips in our body.
  

Backbone of human being consists of 33 vertebra placed one over the other. These include:

i) 24 presacral vertebrae (7 cervical, 12 thoracic, and 5 lumbar) followed by the
ii) sacrum (5 fused sacral vertebrae) and the
iii) coccyx (4 frequently fused coccygeal vertebrae).

• A muscular foot comes out from the opening in the shell for movement.
• Foot of the snail is attached with it's belly.
• The foot produces wavy motions which are very slow.
  

There are 12 Ribs cages on each side of chest.

Topic in NCERT: Fixed Joints

Line in NCERT: "There are 12 ribs on each side of rib cage."

The parts of the body that help in movement are:

(i)  Bones

(ii) Joints

(iii) Contraction and relaxation of muscles.

The joint where our neck joins the head is a pivotal joint. It allows us to bend our head forward and backward and turn the head to our right or left.

Answer: C) Skull
Explanation: Your skull protects your brain from injury

• When a baby is born, their skeleton has around 305 bones.
• As they grow, some of these bones fuse together, and by the time they become an adult, the number of bones decreases to about 206.
• This is because some of the smaller bones in a baby's body fuse to form larger bones as they grow older.
• So, when we are born, we have many more bones in our bodies compared to when we are all grown up.

Earthworms move by alternately extending and contracting their body using muscles. These muscles help the earthworm to crawl through the soil.