IB Biology HL B3.3.3 Hl Titin and Antagonistic Muscles Topic Practice

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Study B3.3.3 (HL)—Titin and antagonistic muscles conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

Question 1

[Maximum number: 3]

The diagram shows a section through part of the leg of an insect and antagonistic muscles X and Y. The tibia moves in the direction shown by the arrow when the muscle is flexing.

Figure for Question 1 — IB Biology HL

Question (a)

(a)

Outline a reason for the muscles being described as antagonistic.

[ 1 ]

Question (b)

(b)

Describe the role of muscle Y.

[ 2 ]
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