Question

make a fist and tighten your fingers

a. where are the muscles that let you tighten your fingers


b. what happens to them when you tighten your fingers​

Answer 1

Answer:

a. A separate muscle (the adductor pollicis) is used to pull the thumb towards the palm. The hypothenar eminence muscles are mainly used for mainly used for sticking out the little finger and pulling it inwards again, and for tightening the skin that covers the hypothenar eminence.

b.When cartilage is compressed by the motion of a finger, a very slippery fluid, called synoutal fluid, oozes out to lubricate the joint. Synovial fluid reduces the friction to almost nothing, which helps reduce wear and tear on joint surfaces as two adjacent phalanges slide against each other.