Muscles and Contraction

What are the three types of muscle tissue?

• Smooth, cardiac, and skeletal

• Smooth, cardiac, and connective

• Smooth, skeletal, and connective

• Cardiac, skeletal, and connective

Which type of muscle tissue is found in the walls of hollow visceral organs?

• Smooth muscle tissue

• Cardiac muscle tissue

• Skeletal muscle tissue

• Connective muscle tissue

What is the specialized name for the endoplasmic reticulum in muscle cells?

• Sarcoplasmic reticulum

• Mitochondrial reticulum

• Cardiac reticulum

• Smooth reticulum

What is the function of the sarcoplasmic reticulum in muscle cells?

• To store and release calcium ions

• To produce ATP

• To transport nutrients

• To contract and relax the muscle

What is the role of troponin and tropomyosin in muscle contraction?

• They block actin sites and are moved by calcium

• They bind to myosin and cause contraction

• They produce ATP for muscle energy

• They relax the muscle after contraction

What triggers the release of calcium from the sarcoplasmic reticulum?

• An action potential traveling down the T-tubules

• The binding of ATP to myosin

• The release of acetylcholine by motor neurons

• The contraction of actin and myosin

What happens when myosin binds to actin during muscle contraction?

• The sarcomere contracts and the muscle shortens

• The sarcomere relaxes and the muscle lengthens

• The calcium is released from the sarcoplasmic reticulum

• The ATP is broken down into ADP and phosphate

What is the role of ATP in muscle contraction?

• To provide energy for myosin to bind and release from actin

• To transport calcium ions into the sarcoplasmic reticulum

• To relax the muscle after contraction

• To produce acetylcholine for motor neuron signaling

What happens when myosin releases from actin during muscle relaxation?

• The sarcomere lengthens and the muscle relaxes

• The sarcomere contracts and the muscle shortens

• The calcium is released from the sarcoplasmic reticulum

• The ATP is broken down into ADP and phosphate

What is the main source of ATP for muscle cells?

• Mitochondria

• Sarcoplasmic reticulum

• T-tubules

• Motor neurons

Tags

NGSS.HS-LS1-7