Podcast
Questions and Answers
What triggers contractions in smooth muscle cells?
What triggers contractions in smooth muscle cells?
- Extracellular calcium entering the cell (correct)
- Primarily from intracellular calcium levels
- Neuronal ion channel localization
- Intrinsic electrical impulses from the heart
How are thick filaments arranged in smooth muscle cells?
How are thick filaments arranged in smooth muscle cells?
- In a single central line along the sarcolemma
- In structured bundles aligned with myofibrils
- Scattered throughout the sarcoplasm (correct)
- In straight parallel lines throughout the cell
What is the primary mechanism by which muscle tension is increased during movement?
What is the primary mechanism by which muscle tension is increased during movement?
- Activation of muscle fibers only
- Activation of more motor units (correct)
- Inhibition of motor units
- Reduction of muscle tone
What is a characteristic feature of smooth muscle tissue contraction?
What is a characteristic feature of smooth muscle tissue contraction?
What occurs in a muscle experiencing atrophy?
What occurs in a muscle experiencing atrophy?
In which type of contraction does the muscle length change while maintaining constant tension?
In which type of contraction does the muscle length change while maintaining constant tension?
Which statement about smooth muscle cells is true?
Which statement about smooth muscle cells is true?
What is the purpose of creatine phosphate (CP) during muscle contraction?
What is the purpose of creatine phosphate (CP) during muscle contraction?
What differentiates smooth muscle from cardiac muscle regarding contraction?
What differentiates smooth muscle from cardiac muscle regarding contraction?
Which energy production process requires oxygen and generates the majority of ATP in resting muscle cells?
Which energy production process requires oxygen and generates the majority of ATP in resting muscle cells?
What passive factors help return a muscle to its elongated state after contraction?
What passive factors help return a muscle to its elongated state after contraction?
How long can energy reserves in creatine phosphate typically last during intense contraction?
How long can energy reserves in creatine phosphate typically last during intense contraction?
What is the end product of aerobic metabolism besides ATP?
What is the end product of aerobic metabolism besides ATP?
What is the primary product of glycolysis?
What is the primary product of glycolysis?
Which process occurs when glycolysis continues despite low oxygen levels?
Which process occurs when glycolysis continues despite low oxygen levels?
What primarily causes muscle fatigue in athletes?
What primarily causes muscle fatigue in athletes?
What is not a part of the recovery period for muscles?
What is not a part of the recovery period for muscles?
What characteristic is unique to fast-twitch muscle fibers?
What characteristic is unique to fast-twitch muscle fibers?
What factor primarily determines the endurance of a muscle?
What factor primarily determines the endurance of a muscle?
Which of the following best describes slow-twitch fibers?
Which of the following best describes slow-twitch fibers?
What happens to breathing rate during the recovery period?
What happens to breathing rate during the recovery period?
Which muscle is primarily responsible for extending the elbow?
Which muscle is primarily responsible for extending the elbow?
Which muscle group is responsible for flexing the wrist?
Which muscle group is responsible for flexing the wrist?
What is the function of the supraspinatus muscle?
What is the function of the supraspinatus muscle?
Which of the following muscles is a primary flexor of the thigh?
Which of the following muscles is a primary flexor of the thigh?
Which muscles work across the knee joint to facilitate leg movement?
Which muscles work across the knee joint to facilitate leg movement?
What condition can result from inflammation of the retinacula in the forearm?
What condition can result from inflammation of the retinacula in the forearm?
Which muscle is NOT primarily involved in wrist extension?
Which muscle is NOT primarily involved in wrist extension?
Which group of muscles is responsible for abducting and extending the thumb?
Which group of muscles is responsible for abducting and extending the thumb?
What is the primary role of skeletal muscles in the muscular system?
What is the primary role of skeletal muscles in the muscular system?
Which connective tissue covers the entire muscle?
Which connective tissue covers the entire muscle?
How many skeletal muscles approximately make up the muscular system?
How many skeletal muscles approximately make up the muscular system?
What function do skeletal muscles perform to guard entrances and exits of the body?
What function do skeletal muscles perform to guard entrances and exits of the body?
Skeletal muscle cells are also referred to as what?
Skeletal muscle cells are also referred to as what?
Which of the following is NOT a function of skeletal muscles?
Which of the following is NOT a function of skeletal muscles?
Which of the following correctly describes the perimysium?
Which of the following correctly describes the perimysium?
What is the role of muscle contractions in relation to body temperature?
What is the role of muscle contractions in relation to body temperature?
