Domanda del libro di testo
An epithelium that has several layers, with an apical layer of flattened cells, is called (choose all that apply):
a. Ciliated
b. Columnar
c. Stratified
d. Simple
e. Squamous
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4. Tissues & Histology
Introduction to Muscle Tissue
Scelta multipla
Which protein makes up the thick filaments of a myofibril?
A
Myosin
B
Troponin
C
Actin
D
Tropomyosin
Guida verificata passo dopo passo1
Understand the structure of a myofibril: Myofibrils are composed of repeating units called sarcomeres, which are the basic functional units of muscle fibers.
Identify the components of a sarcomere: Each sarcomere contains thick and thin filaments. The thick filaments are primarily composed of the protein myosin, while the thin filaments are primarily composed of actin, along with regulatory proteins such as troponin and tropomyosin.
Focus on the thick filaments: The thick filaments are responsible for muscle contraction and are made up of myosin molecules. Myosin is a motor protein that interacts with actin to generate force.
Differentiate between the proteins: Myosin is the protein that forms the thick filaments, while actin forms the thin filaments. Troponin and tropomyosin are associated with the thin filaments and play roles in regulating muscle contraction.
Conclude with the correct identification: Based on the structure and function of the sarcomere, the protein that makes up the thick filaments of a myofibril is myosin.
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