Podcast
Questions and Answers
What type of contraction is isotonic contraction?
What type of contraction is isotonic contraction?
- The length of the muscle changes (correct)
- The muscle does external work
- The duration is adapted to muscle functions
- The tension remains constant
What factor determines muscle tension in a single muscle fiber?
What factor determines muscle tension in a single muscle fiber?
- Length of the tendons
- Thickness of the epimysium
- Frequency of action potential (correct)
- Amount of myoglobin
What muscle provides slow contraction for continual, long-term support against gravity?
What muscle provides slow contraction for continual, long-term support against gravity?
- Gastrocnemius
- Rectus femoris
- Biceps brachii
- Soleus (correct)
Which factor results in lesser tension developed in a single muscle fiber?
Which factor results in lesser tension developed in a single muscle fiber?
What must ocular movements be in order to maintain fixation of the eyes on specific objects?
What must ocular movements be in order to maintain fixation of the eyes on specific objects?
What muscle contract moderately rapidly to provide sufficient velocity of limb movement for running and jumping?
What muscle contract moderately rapidly to provide sufficient velocity of limb movement for running and jumping?
What are factors determining muscle tension in a single muscle fiber?
What are factors determining muscle tension in a single muscle fiber?
In which type of contraction does the duration adapt to the functions of respective muscles?
In which type of contraction does the duration adapt to the functions of respective muscles?
What is a motor unit composed of?
What is a motor unit composed of?
Which type of muscles generally have more nerve fibers for fewer muscle fibers in a motor unit?
Which type of muscles generally have more nerve fibers for fewer muscle fibers in a motor unit?
Which muscle fiber type can deliver greater amounts of powerful forces for a few seconds to a minute or so?
Which muscle fiber type can deliver greater amounts of powerful forces for a few seconds to a minute or so?
Which muscle fiber type provides endurance and delivers prolonged strength of contraction over many minutes to hours?
Which muscle fiber type provides endurance and delivers prolonged strength of contraction over many minutes to hours?
What are fast-twitch muscle fibers mainly composed of?
What are fast-twitch muscle fibers mainly composed of?
Which feature characterizes slow-twitch muscle fibers?
Which feature characterizes slow-twitch muscle fibers?
Why do small muscles that require fine control have more nerve fibers for fewer muscle fibers?
Why do small muscles that require fine control have more nerve fibers for fewer muscle fibers?
What is a characteristic of slow fibers compared to fast fibers?
What is a characteristic of slow fibers compared to fast fibers?
What gives slow muscles a reddish appearance?
What gives slow muscles a reddish appearance?
Which fiber type has greatly increased numbers of mitochondria?
Which fiber type has greatly increased numbers of mitochondria?
What is the primary function of myoglobin in slow fibers?
What is the primary function of myoglobin in slow fibers?
Which fiber type has a large amount of glycolytic enzymes for rapid energy release?
Which fiber type has a large amount of glycolytic enzymes for rapid energy release?
What contributes to the reddish appearance of slow muscles?
What contributes to the reddish appearance of slow muscles?
Which fiber type is characterized by having a less extensive blood supply compared to slow fibers?
Which fiber type is characterized by having a less extensive blood supply compared to slow fibers?
What is the primary function of myoglobin in slow muscles?
What is the primary function of myoglobin in slow muscles?
What does summation in muscle contraction refer to?
What does summation in muscle contraction refer to?
Which of the following is NOT a way in which summation can occur in muscles?
Which of the following is NOT a way in which summation can occur in muscles?
What is the term used to describe the process of successive contractions fusing together into a smooth and continuous muscle contraction?
What is the term used to describe the process of successive contractions fusing together into a smooth and continuous muscle contraction?
Which factor contributes to tetanus in muscle contractions?
Which factor contributes to tetanus in muscle contractions?
What happens during tetanic contraction?
What happens during tetanic contraction?
What is one cause of muscle fatigue?
What is one cause of muscle fatigue?
In multiple fiber summation, what happens as the strength of the stimulus increases?
In multiple fiber summation, what happens as the strength of the stimulus increases?
What is the main difference between fast-twitch fibers and slow-twitch fibers?
What is the main difference between fast-twitch fibers and slow-twitch fibers?
Which property of skeletal muscles is associated with the 'all or none law'?
Which property of skeletal muscles is associated with the 'all or none law'?
What does the 'all or none law' state about muscle contraction?
What does the 'all or none law' state about muscle contraction?
Which type of stimulus is required to elicit an action potential in skeletal muscles?
Which type of stimulus is required to elicit an action potential in skeletal muscles?
What happens during depolarization of an action potential in skeletal muscles?
What happens during depolarization of an action potential in skeletal muscles?
Which type of contraction involves muscle length remaining constant but tension changing?
Which type of contraction involves muscle length remaining constant but tension changing?
What defines tetanus in the context of muscle contraction?
What defines tetanus in the context of muscle contraction?
