Lecture 10 P1

Question 1

What are the 3 types of muscle tissue

Answer 1

Skeletal muscle, cardiac muscle, and smooth muscle

Question 2

What is the function of smooth muscle

Answer 2

Opens/closes tubes
Regulates diameter of tubes
Propels material through tubes/sacs

Question 3

What is the function of cardiac muscle

Answer 3

Creates driving pressure through to move blood through vessels

Question 4

Function of skeletal muscle

Answer 4

Moves joints to then move the body
Generates heat
Maintains posture
Energy transduce; creates atp through cell respiration

Question 5

Which 3 muscle tissues are voluntary and involuntary

Answer 5

Skeletal is voluntary
Cardiac is involuntary
Smooth is involuntary

Question 6

Define fascicle

Answer 6

Bundle of muscle cells.

Question 7

Name the 4 hierarchy’s of the muscle

Answer 7

Fascicle, myofiber, myofibril, myofilaments(sarcomeres)

Question 8

What 2 myofilaments are sarcomeres made of

Answer 8

Thick filaments (myosin) and think filaments (actin)

Question 9

What is sarcoplasm

Answer 9

The cytoplasm with in a muscle cell.

Question 10

What is the sarcoplasmic reticulum

Answer 10

Where calcium is stored and released to create action potentials during muscle contractions

Question 11

What are transverse tubules?

Answer 11

They conduct action potentials to the sarcoplasmic reticulum

Question 12

Describe a sarcomeres

Answer 12

-A structure within the myofibrils.
-Z disc to Z disc.
-Made up of 2 myofilaments (myosin and actin)
-h zone in the center(thick filaments only)
-A band has thick and thin filaments
-I band has thin filaments only

Question 13

Muscle cells are filled with organelles called?

Answer 13

Fascicles

Question 14

Fascicles are made up of?

Answer 14

Myofibers

Question 15

Myofibers are made up of?

Answer 15

Myofibrils

Question 16

Thick filaments are made up of proteins called?

Answer 16

Myosin

Question 17

Think filaments are made up of protein called?

Answer 17

Actin

Question 18

What is the protein in muscle cells that bind ca+2 and initiates muscle contraction

Answer 18

Troponin

Question 19

What is the protein in muscle cells that cover myosin binding sites on actin

Answer 19

Tropomyosin

Question 20

Name the functional unit of contraction in a muscle cell

Answer 20

Sarcomeres

Question 21

When a muscle cell contracts what happens to the H zone, I band, and A band

Answer 21

H zone will shorten
I band will shorten
A band has no change

Question 22

When a muscle cell contracts what happens to the sarcomere, thin filament, and thick filament

Answer 22

Sarcomere will shorten
Thin filament will have no change
Thick filament will have no change

Question 23

When a muscle cell contracts what happens to the myofibrils and Myofibers

Answer 23

Myofibrils will shorten
Myofibers will shorten

Question 24

Name the binding sites on the myosin head

Answer 24

Atp binding site and actin binding site

Question 25

Name the binding sites on the actin molecule

Answer 25

Myosin binding site

Question 26

What is the connection between between the myosin head and actin called during a muscle contraction

Answer 26

A cross bridge

Question 27

What is the name of the mechanism for muscle cell contraction

Answer 27

The sliding filament mechanism

Question 28

Where is ca +2 stored in the muscles?

Answer 28

In the sarcoplasmic reticulum

Question 29

What are the 2 types of muscle contractions

Answer 29

Excitation-contraction coupling and sliding filament mechanism

Question 30

What does contraction refer to

Answer 30

Sarcomere shortening in muscle cells

Question 31

What happens when sarcomeres shorten?

Answer 31

Thick and thin filaments slide over each other bringing Z disc closer to each other

Question 32

How do myosin heads release from myosin binding sites