Chapter 9&10 Muscular Sys Exam Review (Part 2)

What two chemicals are necessary for muscle contraction to occur?

• Niacin and Potassium
• Calcium and ATP
• Sodium and Potassium
• Ach and Potassium

Calcium:

• covers the active site on the actin

• increases the action potential along the sarcolemma

• binds to proteins on myosin

• moves to tropomyosin & triggers the binding of myosin to actin

What is a crossbridge?

• Where myosin binds to actin

• Where the calcium crosses into the cytoplasm

• Where calcium binds with troponin

The energy needed to perform a muscle contraction (detach and recock the myosin head) comes directly from

• ATP

• Calcium

• Glucose

Tags

NGSS.HS-LS1-7

Cellular respiration that occurs without oxygen present is called

• aerobic
• anaerobic
• isotonic
• isometric

Tags

NGSS.HS-LS2-3

Anaerobic respiration results in "oxygen debt" and then the buildup of ________ in the muscles.

• ATP

• lactic acid

• creatine

Tags

NGSS.HS-LS2-3

The mechanism of muscle contraction when thick and thin myofibrils "slide" past one another.

• sarcoplasmic reticulum

• fasciitis

• sliding filament mechanism

• muscle cramps

SFM Step 1: Calcium binds to ___of the troponin-tropomyosin complex and moves the "rope away from the active site".

• troponin

• tropomyosin

SFM Step 2: __forms a crossbridge with actin head.

• ATP

• myosin active site

• calcium

SFM Step 3: A _ is performed pulling actin past myosin during muscle contraction.

• "Power Stroke"

• "Crossbridge"