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Stack 2 Physio

Weeks 7-13

QuestionAnswer
What starts an action potential in a neuron? A stimulus that causes sodium channels to open, allowing Na⁺ to rush in and depolarize the cell.
What is the primary role of the central nervous system (CNS)? To process and interpret information and coordinate the body's responses.
What does the peripheral nervous system (PNS) do? It carries sensory information to the CNS and motor commands from the CNS to the body.
What is the difference between the sympathetic and parasympathetic systems? Sympathetic = “fight or flight”; Parasympathetic = “rest and digest.”
How do sensory receptors turn stimuli into signals? They convert physical or chemical changes into electrical impulses that travel to the brain.
What makes hormones different from nerve signals? Hormones travel through the bloodstream and act slower but have longer-lasting effects.
What is the path of blood flow starting from the right atrium? Right atrium → right ventricle → lungs → left atrium → left ventricle → body.
What are the main components of blood? Plasma, red blood cells, white blood cells, and platelets.
What is the function of lymph nodes? They filter lymph and activate immune responses when pathogens are detected.
What allows gas exchange to happen efficiently in the lungs? Thin alveoli walls, close contact with capillaries, and a high surface area.
Created by: user-1990886
 

 



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