⚙️ SET 7: Myofilaments (Actin & Myosin) AND 🧬 SET 8: Sarcomere Structure
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16 Terms
What are the two types of myofilaments?
Actin (thin) and myosin (thick)
What is actin made of?
G actin, tropomyosin, and troponin
What is the function of actin?
Provides binding sites for myosin
What is the function of tropomyosin?
Blocks binding sites on actin
What is the function of troponin?
Regulates contraction by moving tropomyosin
What is myosin made of?
Heads, hinges, and rods
What is the function of the myosin head?
Bind to actin and break down ATP
What is a cross-bridge?
The connection between myosin head and actin
What is a sarcomere?
The smallest contractile unit of muscle
What structure defines a sarcomere?
Z discs
What do Z discs do?
Anchor thin filaments
What is the A band?
The region containing thick filaments
What is the I band?
The region containing only thin filaments
What is the H zone?
The area with only thick filaments
What is the M line?
The center of the sarcomere containing structural proteins
Why do muscles appear striated?
Due to repeating A and I bands