Nerve & Muscle Function MCQ Flashcards
What are the Body Fluid Volumes for a 70Kg Male?
Extra cellular fluid = 14 litres Intracellular fluid = 28 litres Total body water = 42 litres Interstitial fluid = 10.5 litres Plasma volume = 5 litres
What statement best describes Homeostasis?
Maintaining a near constant internal environment
If a sample of red blood cells were placed in a solution with osmolality of 250 mOsm/Kg H2O they would:
Swell, as water enters the cell to balance out concentration gradient.
The intracellular Na+ concentration is lower inside, compared to outside the cell….
This concentration difference is maintained by the expenditure of metabolic energy
The membrane of all cells:
Has within its structure a Na pump (Na+, K+ ATPase)
What is action potential?
A transient depolarisation of a cell
The sympathetic nervous system
When activated is responsible for adrenaline section from the adrenal glands
During muscular contraction
The sarcomere shortens
Neuromuscular transmission at the motor end plate
Is due to acetylcholine binding to a nicotinic receptor on the muscle membrane
During the process of excitation-contraction coupling
Cross bridges form when ATP binds to myosin head
The muscle spindle reflex:
Is stimulated by muscle stretch
The strength of contraction of a skeletal muscle, such as the gastrocnemius muscle, may be regulated by:
Recruiting different numbers of motor units
The reflex arc pathway involves:
Sensory receptors
Afferent neurone
Efferent Neurone
Response by effector target
