What Causes Muscles to Twitch

question 123

Multiple Choice

 What causes muscles to twitch?

• A) depolarization of the muscle fiber produced by an influx of sodium ions
• B) depolarization of the muscle fiber produced by an influx of potassium ions
• C) hyperpolarization of the muscle fiber produced by an influx of calcium ions
• D) hyperpolarization of the muscle fiber produced by an outflow of potassium ions

---

Definitions:

Femoral vein

A major blood vessel in the thigh and leg that returns oxygen-depleted blood back to the heart.

Inguinal veins

Blood vessels located in the inguinal (groin) area that drain blood from the lower limbs back to the heart.

Median cubital

Referring to the median cubital vein, a prominent vein located in the cubital fossa of the arm, commonly used for venipuncture.

Cephalic veins

Superficial veins located in the lateral aspect of the arm, often used for intravenous access or blood drawing.