Muscluar System Exhibition Lab

Question 1

what are the 7 reasons that you need muscles for

Answer 1

protect internal organs maintain posture maintain body position digest food maintain body temp. Breathe Pump blood

Question 2

muscles are a very complex group of ______.

Answer 2

cells

Question 3

what’s another name for a group of myofibrils that are found within muscle cells?

Answer 3

Muscle fibers/muscle cells

Question 4

Why does cardiac muscle never fatigue

Answer 4

has lots of mitochondria

Question 5

is cardiac muscle mononucleated or multinucleated

Answer 5

mononucleated

Question 6

whats a heart cell called

Answer 6

myocardiocyte

Question 7

what does skeletal muscle do

Answer 7

produces movement and maintains posture generates body heat

Question 8

how many skeletal muscles are in your body

Answer 8

400+

Question 9

are skeletal muscles mono or multinucleated, striated or not striated

Answer 9

Mononucleated not striated

Question 10

where is smooth muscle found

Answer 10

hollow internal organs esophagus stomach bladder uterus lining of blood vessels

Question 11

Smooth muscle cells are shaped like what? Are they mono or multi nucleated, striated or not striated?

Answer 11

shaped like spindles mononucleated not striated

Question 12

There’s no muscles in your fingers, only bones, ligaments and tendons. How are they able to move?

Answer 12

Muscles pull on tendons in order to move bones

Question 13

Describe skeletal muscles

Answer 13

work in pairs Muscle pairs are called antagonistic pairs.

Question 14

What are motor neurons connected to

Answer 14

myofibrils

Question 15

describe the 3 step sequence of events that lead to movement of muscles

Answer 15

1)brain sends electrochemical to nerves 2) nerves release chemical messengers called neurotransmitters 3) Neurotransmitters signal muscle movements

Question 16

what does ALS stand for

Answer 16

Amyotrophic lateral sclerosis

Question 17

whats ALS

Answer 17

Neurodegenerative disease, effects motor neurons and nerve cells

Question 18

whats some of the symptoms of ALS

Answer 18

Weakness, paralysis, ultimately respiratory failure

Question 19

whats actin and myosin

Answer 19

Repeating units of contractive proteins found in muscle fibers thin filaments- actin thick filaments- myosin

Question 20

How do muscles contract

Answer 20

Sliding the filaments over each other so that they squeeze into an overlapping position

Question 21

Muscles fibers use what as an energy source and require what?

Answer 21

ATP and oxygen

Question 22

Whats lactic acid

Answer 22

waste product formed during anaerobic respiration

Question 23

How does lactic acid contribute to muscle fatigue

Answer 23

build up of lactic acid decreases muscle ability to contract leads to muscle fatigue

Question 24

look @ the pic

Answer 24

look @ the pic