Question

question 9
in a sarcomere, what part of the a band has no actin filaments?
none of the choices
section: 33.4 blooms: knowledge
z band
h band
t bans
q zone
question 10
the mechanical force that resists gravity in the lifting of an object is
a motor unit
muscle tension
tetanus
section: 33.5 blooms: knowledge
a muscle twitch
muscle fatigue
question 11

Explanation:

• For Question 9: In a sarcomere, the H - band within the A - band is the region that lacks actin filaments. The A - band contains both actin and myosin filaments, while the H - band is the central part of the A - band where only myosin filaments are present.
• For Question 10: Muscle tension is the mechanical force generated by muscle contraction that resists gravity when lifting an object. A motor unit is a functional unit of muscle - nerve interaction, tetanus is a sustained muscle contraction, a muscle twitch is a single, brief muscle contraction, and muscle fatigue is a decrease in muscle performance due to repeated or prolonged activity.

Answer:

• Question 9: C. H band
• Question 10: B. muscle tension