Examlex
The following statements describe features of cardiovascular systems. Match the appropriate system from the list to each description. Some choices may be used more than once.
-two-circuit system in which oxygen-rich and oxygen-poor blood mix
A)direct gas exchange
B)open circulatory system
C)two-chambered heart
D)three-chambered heart
E)four-chambered heart
Myosin Heads
The part of the myosin protein that binds to actin filaments and performs the power stroke to cause muscle contraction.
Cross-Bridges
The connections formed between actin and myosin filaments in muscle fibers during contraction.
Actin Myofilaments
Thin filaments within muscle cells that, along with myosin, contribute to muscle contraction and relaxation.
Threshold Level
A threshold level refers to the minimum intensity that stimulates a perceptible response in a physical, biological, or psychological system.
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