BT : Test 2 Flashcards
Which protein covers myosin binding sites located on actin filament:
b) tropomyosin
Isometric muscle contraction takes place when:
a) you try to lift something that is too heavy for you
Voluntary muscles are innervated by:
b)somatic nerves
Calcium ions attach to:
a) troponin
ATP is:
c) an energy storing molecule
In a dead person muscles are stiff because:
a) the myosin is unable to disconnect from actin
ATP connects to:
a) myosin head
Actin binding sites are located on:
c) myosin heads
Smooth muscles:
a) contain actin and myosin
Smooth muscles:
a) unstriated and involuntary
Skeletal muscles can contract:
c) isotonicaly or isometricaly
Sarcoplasmic reticulum serves as a storage of:
a) calcium ions
Choose correct answer:
d) all answers are correct
- Schwann cells form myelin in PNS
- oligodendrocytes forms myelin in CNS
- microglia are residual macrophages
Salutatory propogation of the action potential:
b) is faster than serial propogation
During depolarization in a nerve cell:
d) sodium diffused into the cell
Salutatory potential propogation rate can be up to:
d) 120m/s
When muscle contracts ATP is split into:
a) ADP and inorganic phosphate
Thin filament:
c) a+b correct
- contains actin
- contains tropomyosin
Cardiomyocytes contain:
a) single nucleus
The basic structural and functional unit of the muscle is:
b) sarcomere
Enchondral ossification:
- cartilage model
- formation of primary ossification center
- blood vessels enter the ossification center
- formation of secondary ossification center
- formation of bone marrow cavity
Intramembranous ossification takes place in:
d) a+b correct
- clavicle
- bones of the skull
Characteristics of smooth muscle
- unstriated
- involuntary (innervated by autonomic nervous system)
- in the walls of visceral organs
- small elongated cells which possess centrally located nucleous
Characteristics of cardiac muscle
- striated
- involuntary
- in the heart
- single nucleus, cells connected with special junctions-conducting electrical impulses
Smooth muscle contains:
Isometric Contraction:
- 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
Muscle bundles are covered up by:
Epimysium
Where is compact bone?
- 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
What’s the longest part of the neuron?
Axon
Where is Ependymal cells? Function?
- 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
Where is elastic cartilage found?
- numerous elastic fibers in matrix
- found in auricle of the ear
- supports and provides framework/external ear, epiglottis, auditory tubes
