11.2b Muscles & Movement

DBQ: Transverse Sections of Striated Muscle (p.267)

1) Different from a transverse section of the muscle, the longitudinal section goes along the long axis. The transverse section crosses the longitudinal section, or in short stands perpendicular to it. 

2) The light band 

3) The first diagram consists of both the second and third pattern together, so the first and second are similar as well as the first and third. Unlike the first pattern, the second and third pattern have only one kind of homogeneous types of dots. The first has a contrasting 2 types of dots in its pattern. 

4) The pattern of dots in first diagram represents the actin and myosin in the sacromere, thus show heterozygous traits of dots. The following diagram has dots to show the central region of the dark band, representing just the thick myosin. Lastly, the diagram represents the light band, with the dots as thin actin. 

One thought on “11.2b Muscles & Movement

  1. Grade 6 A consistent and thorough understanding of the required knowledge and skills, and the ability to apply them in a wide variety of situations. Consistent evidence of analysis, synthesis and evaluation is shown where appropriate. The student generally demonstrates originality and insight.

    Data-based questions: transverse sections of striated muscle
    page 267

    1. A longitudinal section is one that is cut along the long axis of a structure.
    A cross section would be one that is perpendicular to the long axis.

    2. The light band as it contains only actin.

    3. The first and second have the same pattern of large dots;
    the first and the third have the same pattern of small dots;
    the first is heterogenous while the second and the third are homogenous;
    the first is a combination of the second and the third.

    4. The first diagram shows the region of the sarcomere where actin and myosin are both found (the dark band),
    the second diagram shows myosin only (central part of dark band – sometimes called the H zone).
    The last diagram shows actin only (light band).

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