แบบฝึกหัด Mock TBAT Biology โค้งสุดท้ายชุด 2

A 70 kg adult male has a total body water (TBW) of approximately 60% of his body weight. If he experiences a pure water loss (e.g., through insensible perspiration without solute loss), how will this affect his Intracellular Fluid (ICF) and Extracellular Fluid (ECF) volumes?

A research molecule selectively blocks the transient outward $K^+$ current ($I_{to}$) in ventricular cardiomyocytes. Which phase of the cardiac action potential will be most directly affected, and what is the expected change in the action potential morphology?