Exam 1: BIOS 255 / BIOS255 (Latest Update 2025 / 2026) Anatomy and Physiology III with Lab | Questions with Answers | Grade A | 100% Correct - Chamberlain

Exam 1: BIOS 255 / BIOS255 (Latest
Update ) Anatomy and
Physiology III with Lab | Questions
with Answers | Grade A | 100%
Correct - Chamberlain


Question:
function of WBC's
Answer:
defend the body against infections and foreign substances




Question:
what ions move through the membrane of cardiac muscle cells during heart
action potential?
Answer:
sodium ions, calcium ions, potassium ions

,Question:
what do sodium ions do during heart action potential?
Answer:
causes membrane potential to become more positive quickly




Question:
what do calcium ions do during heart action potential?
Answer:
facilitate the contraction of the heart muscle during the plateau phase




Question:
what do potassium ions do during heart action potential?
Answer:
helps return the membrane potential back to resting by moving out of the cell




Question:
P wave in an ECG/EKG
Answer:
represents atrial depolarization; happens when electrical impulse spreads
thru the atria causing them to contract and push blood into the ventricles

, Question:
QRS complex of ECG/EKG
Answer:
represents ventricular depolarization; happens when the ventricles contract




Question:
T wave of ECG/EKG
Answer:
represents ventricular repolarization; happens when the ventricles relax




Question:
PR interval in ECG/EKG
Answer:
time it takes impulses to travel from atria to ventricles




Question:
QT interval in ECG/EKG
Answer:
time it takes ventricles to contract and relax