Which of the following statements about movement and...

Name: Problem 9, Chapter 45: Biology
Uploaded: 2021-07-12T21:51:01-08:00
Duration: 3 min 40 s
Channel: Norma Kimmel
Description: Which of the following statements about movement and locomotion is false? a. Terrestrial animals and flying animals expend energy to provide lift. b. Swimming animals typically expend energy to provide thrust but not lift. c. Flexors and extensors are examples of muscles called agonists. d. Flexors cause bending at a joint. e. Extensors cause straightening of a limb.

Which of the following statements about movement and locomotion is false? a. Terrestrial animals and flying animals expend energy to provide lift. b. Swimming animals typically expend energy to provide thrust but not lift. c. Flexors and extensors are examples of muscles called agonists. d. Flexors cause bending at a joint. e. Extensors cause straightening of a limb.

Which of the following statements about movement and locomotion is false?
a. Terrestrial animals and flying animals expend energy to provide lift.
b. Swimming animals typically expend energy to provide thrust but
not lift.
c. Flexors and extensors are examples of muscles called agonists.
d. Flexors cause bending at a joint.
e. Extensors cause straightening of a limb.

Key Concepts

Agonist and Antagonist Muscles

In the context of muscle movement, the agonist is the primary muscle responsible for executing a movement, whereas the antagonist opposes that movement to provide balance and control. It is important to note that, although different muscles may perform similar movements (like flexion or extension), they are not simultaneously classified as agonists; each muscle's role depends on the specific action and timing.

Locomotion Mechanics

Locomotion is the study of how organisms move, which involves analyzing the forces and energy expenditures required for different environments, such as the application of thrust in water or the generation of lift in the air. Understanding these mechanics helps explain how animals optimize movement based on their ecological niches.

Thrust and Lift

Thrust refers to the force that propels an animal forward, commonly generated by pushing against a medium like water or air, while lift is the upward force that counteracts gravity, crucial for flight. Recognizing the difference between these forces is essential for differentiating the demands of swimming, flying, and terrestrial movement.

Muscle Actions

Muscle actions are defined by the movements they produce at joints, such as flexion, which involves bending a joint, and extension, which involves straightening it. These classifications are fundamental to understanding how coordinated muscle activities contribute to overall movement.

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