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physiology

flashcards for physiology

QuestionAnswer
what determines the amount of movement a joint can produce? The shape of the articulating bones, the presence of ligaments, and the tightness of the joint capsule determine mobility.
What ion triggers muscle contraction in skeletal muscle? calcium it binds to troponin, causing tropomyosin to shift and expose acting binding sites for myosin.
what happens during the sliding filament mechanism? Myosin heads pull actin filaments towards the center of the sarcomere shortening the muscle. ATP is required for both attachment and release
What causes an action potential to begin? When a neuron reaches threshold , voltage gated Na channels open causing rapid depolariazation.
What is the main difference between the CNS and PNS The CNS includes the brain and spinal cord and handles integration the PNS includes all nerves leaving the CNS and handles all communication with the body.
How do endocrine glands send signals? They release hormones into the bloodstream which travel to target cells with specific receptors.
What is the function of the SA node? The SA node acts as the heart's pacemaker initiating each heartbeat through spontaneous depolarization.
What is the main function of red blood cells? RBCs transport oxygen using hemoglobin and help carry some CO2.
What is the role of the lymphatic system? It returns excess fluid to the bloodstream and houses immune cells that defend against pathogens.
How does gas exchange occur in the lungs? O2 and CO2 diffuse across the alveolar capillary membrane from high to low concentration.
Created by: user-1989768
 

 



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