Day 10/11 Muscles

Question 1

greater cross sectional area of muscle means

Answer 1

greater force production because more fibres are involved

Question 2

4 factors influencing muscle function

Answer 2

fiber arrangement, angle of tendon pull, length-tension relationship, lever systems

Question 3

Parallel muscle - arrangement and example

Answer 3

all fibres run parallel to one another, biceps brachial

Question 4

Parallel muscle with tendinous bands- arrangement and example

Answer 4

all fibres run parallel and have CT bands regular running transverse through the muscle - rectus abdominis

Question 5

convergent muscle - arrangement and example

Answer 5

fibers originate across a wide area and converge to one tendon insertion - pectoralis

Question 6

unipennate muscle - arrangement and example

Answer 6

all fibres arranged on one side of the tendon - extensor digitorum

Question 7

bipennate muscle - arrangement and example

Answer 7

muscle fibers arranged on either side of the tendon - rectus femoris

Question 8

multipennate muscle - arrangement and example

Answer 8

tendons spread throughout the muscle - deltoid

Question 9

circular muscle - arrangement and example

Answer 9

fibres arranged in concentric rings - orbicular oris

Question 10

longer fibers in muscles means

Answer 10

greater ROM

Question 11

shorter fibres in pennate muscles means

Answer 11

more fibres and more strength

Question 12

muscle pulls from O to I or I to O?

Answer 12

insertion to origin (towards origin)

Question 13

angle of tendon effects?

Answer 13

direction of movement and movement effectiveness

Question 14

anatomical pulleys do what? and example

Answer 14

change tendon angle to allow muscles to cause movement across a joint. ex. patella allowing quad to cause extension of the leg

Question 15

muscle length - tension relation ship what is it and relevance

Answer 15

refers to amount of tension a muscle can produce at a specific muscle length. so a muscle fully extended cannot produce same amount of tension as one that is partially contracted or fully contracted.

Question 16

force point?

Answer 16

where the active muscle exerts its effect on the skeleton

Question 17

resistance point?

Answer 17

centre of gravy of the limb upon which the force point is exerting its effort

Question 18

is the muscle more effective when the force point is close to joint or further away

Answer 18

the further away the force point is from the joint, the more effective the muscle will be.

Question 19

most common lever class in body?

Answer 19

third class:

fulcrum-force-load