BT : Test 2

Question 1

Which protein covers myosin binding sites located on actin filament:

Answer 1

b) tropomyosin

Question 2

Isometric muscle contraction takes place when:

Answer 2

a) you try to lift something that is too heavy for you

Question 3

Voluntary muscles are innervated by:

Answer 3

b)somatic nerves

Question 4

Calcium ions attach to:

Answer 4

a) troponin

Question 5

ATP is:

Answer 5

c) an energy storing molecule

Question 6

In a dead person muscles are stiff because:

Answer 6

a) the myosin is unable to disconnect from actin

Question 7

ATP connects to:

Answer 7

a) myosin head

Question 8

Actin binding sites are located on:

Answer 8

c) myosin heads

Question 9

Smooth muscles:

Answer 9

a) contain actin and myosin

Question 10

Smooth muscles:

Answer 10

a) unstriated and involuntary

Question 11

Skeletal muscles can contract:

Answer 11

c) isotonicaly or isometricaly

Question 12

Sarcoplasmic reticulum serves as a storage of:

Answer 12

a) calcium ions

Question 13

Choose correct answer:

Answer 13

d) all answers are correct

• Schwann cells form myelin in PNS
• oligodendrocytes forms myelin in CNS
• microglia are residual macrophages

Question 14

Salutatory propogation of the action potential:

Answer 14

b) is faster than serial propogation

Question 15

During depolarization in a nerve cell:

Answer 15

d) sodium diffused into the cell

Question 16

Salutatory potential propogation rate can be up to:

Answer 16

d) 120m/s

Question 17

When muscle contracts ATP is split into:

Answer 17

a) ADP and inorganic phosphate

Question 18

Thin filament:

Answer 18

c) a+b correct

• contains actin
• contains tropomyosin

Question 19

Cardiomyocytes contain:

Answer 19

a) single nucleus

Question 20

The basic structural and functional unit of the muscle is:

Answer 20

b) sarcomere

Question 21

Enchondral ossification:

Answer 21

• cartilage model
• formation of primary ossification center
• blood vessels enter the ossification center
• formation of secondary ossification center
• formation of bone marrow cavity

Question 22

Intramembranous ossification takes place in:

Answer 22

d) a+b correct

• clavicle
• bones of the skull

Question 23

Characteristics of smooth muscle

Answer 23

• unstriated
• involuntary (innervated by autonomic nervous system)
• in the walls of visceral organs
• small elongated cells which possess centrally located nucleous

Question 24

Characteristics of cardiac muscle

Answer 24

• striated
• involuntary
• in the heart
• single nucleus, cells connected with special junctions-conducting electrical impulses

Question 25

Smooth muscle contains:

Question 26

Isometric Contraction:

Answer 26

* creates tension but does not shorten because the load is greater than the force generated by the muscle.This occurs for example when you try to lift an object that’s too heavy for you to move, or when you stand still and your postural muscles hold your body upright * constant length

Question 27

Muscle bundles are covered up by:

Answer 27

Epimysium

Question 28

Where is compact bone?

Answer 28

- shafts of long bones, parralell plates of flat bones - structural unit – Haversian system - Haversian canals - Volkmann’s canals - matrix arranged in lamellae around Haversian canal

Question 29

What's the longest part of the neuron?

Answer 29

Axon

Question 30

Where is Ependymal cells? Function?

Answer 30

* lining of the cavities of the brain * CNS * line the ventricles of the brain and central canal of spinal cord * columnar cells with cilia * Function: active role in formation and circulation of cerebrospinal fluid

Question 31

Where is elastic cartilage found?

Answer 31

* numerous elastic fibers in matrix * found in auricle of the ear * supports and provides framework/external ear, epiglottis, auditory tubes