Asked by Elizabeth Brooks on Jun 16, 2024
Verified
List the following structures in order from smallest to largest.
(1) Muscle fiber
(2) Myofilament
(3) Myofibril
(4) Muscle fascicle
A) 4, 2, 3, 1
B) 2, 1, 4, 3
C) 3, 1, 4, 2
D) 2, 3, 1, 4
E) 1, 2, 3, 4
Muscle Fiber
Muscle cell.
Myofilament
Extremely fine molecular thread helping form the myofibrils of muscle; thick myofilaments are formed of myosin, and thin myofilaments are formed of actin.
Myofibril
A basic rod-like unit of a muscle cell that is responsible for the muscle's contractile properties.
- Comprehend the structure of muscle tissues from the microscopic to the macroscopic scale.
Verified Answer
KM
Kirsten MaundJun 17, 2024
Final Answer :
D
Explanation :
The correct order from smallest to largest is: Myofilament (2), Myofibril (3), Muscle fiber (1), Muscle fascicle (4). Myofilaments are the smallest structures, consisting of actin and myosin proteins that form the contractile units within muscle cells. Myofibrils are made up of many myofilaments and are the basic rod-like units of a muscle cell. Muscle fibers are composed of many myofibrils, making them larger in size. Finally, muscle fascicles are bundles of muscle fibers, making them the largest structure listed.
Learning Objectives
- Comprehend the structure of muscle tissues from the microscopic to the macroscopic scale.