6. The force of skeletal muscle contraction varies with all of the following EXCEPT: a. Amplitude of the muscle action potential b. Frequency of action potentials in the muscle fibers c. Average calcium concentration in the sarcoplasm d. Number of active actin-myosin force generating sites e. Number of active motor units
Added by Emily C.
Close
Step 1
The question asks to identify the factor that does NOT influence the force of skeletal muscle contraction, among the given options. This means we are looking for the EXCEPT option. Show more…
Show all steps
Your feedback will help us improve your experience
Derrick Danso and 76 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Which of the following is true of regulation of tension generation in a single fiber. Select one: a. The tension generated by single fibers is determined by the size of the action potential in the motor neuron b. The stronger the contraction, the lower the cytoplasmic Ca2+ concentration c. Action potentials will summate temporally when the release of Na+ from the sarcoplasmic reticulum exceeds the rate at which it can be pumped back in. d. Tetanus is defined as the degree of fiber tension created by a single action potential e. In a twitch not all myosin binding sites on the actin filaments are exposed
Derrick D.
Which of the following describes the force-frequency relationship? As more action potentials reach the muscle per second, a greater amount of calcium will be present in the muscle cell. This is because not all of the calcium released in response to the previous action potential has been taken back up into the sarcoplasmic reticulum. This increase in calcium concentration leads to a more forceful contraction. The amount of overlap between the actin and myosin filaments at the beginning of the contraction determines how forceful the contraction will be. Greater overlap means that more myosin heads have binding sites available on actin filaments, generating a more forceful contraction. Maximal force production for shortening contractions occurs at very low velocities, and force production is very low at high or maximal velocities. Power is the combination of force and velocity. None of these.
Madhur L.
Which of the following best explains the cellular mechanisms involved in the process of summation in skeletal muscle contraction? a. Increased stimulation frequency results in higher turnover of ATP, which enables the buildup of a greater twitch force. b. Additional motor units are stimulated to contract due to an increase in stimulation frequency, which results in a greater force output from the muscle as a whole. c. Myosin is still bound to actin and the sarcomere is still partially contracted when the muscle is stimulated to contract again. This results in additive levels of force output because the next contraction begins from this state rather than from rest. d. The active transport of calcium ions back into the sarcoplasmic reticulum is accelerated with increased stimulation frequency. This results in longer interactions between actin and myosin, which generates greater muscle tension.
Josee P.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD
