The Following Is a List of the Events That Occur

question 99

Multiple Choice

The following is a list of the events that occur during a muscle contraction. What is the correct sequence of these events?
1) Myosin cross-bridges bind to the actin.
2) The free myosin head splits ATP.
3) Calcium ion is released from the sarcoplasmic reticulum.
4) The myosin head pivots toward the center of the sarcomere.
5) Calcium ion binds to troponin.
6) The myosin head binds an ATP molecule and detaches from the actin.

• A) 1, 3, 5, 4, 6, 2
• B) 5, 1, 4, 6, 2, 3
• C) 3, 5, 1, 2, 4, 6
• D) 3, 5, 1, 4, 6, 2
• E) 1, 4, 6, 2, 3, 5

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Definitions:

Gemmae

Tiny balls of tissue (borne in gemmae cups) used for asexual reproduction by liverworts.

Liverworts

Liverworts are a group of non-vascular plants in the division Marchantiophyta, known for their liver-shaped gametophytes and role in early colonization of terrestrial environments.

Asexually

Reproduction without the combination of genetic material from two different parents, often involving a single organism reproducing by itself.

Archegonia

The female reproductive structure in ferns, mosses, and some conifers, where the egg cell is produced and fertilization occurs.