Final answer:
The ability of a muscle to generate tension immediately after stimulation is dependent on: the calcium ion concentration (Option B). This allows muscle contraction to proceed by activating the troponin-tropomyosin complex, exposing myosin binding sites on actin filaments.
Step-by-step explanation:
The immediate generation of tension in a muscle after stimulation is primarily dependent on the concentration of calcium ions.
When a muscle receives a signal from a motor neuron, calcium ions (Ca++) are released from the sarcoplasmic reticulum (SR) into the sarcoplasm.
These ions bind to the protein troponin, which moves the protein tropomyosin away from binding sites on the actin filament.
This process exposes the binding sites for the myosin heads to attach, initiating muscle contraction.
The contraction will continue as long as Ca++ ions are present to keep the actin-binding sites accessible and ATP is available to power the cross-bridge cycling, which results in the shortening of muscle fibers.
It is important to note that while other factors such as glycogen storage, ATP production, and myoglobin content do play roles in muscle contraction and endurance.
They are not directly responsible for the immediate generation of tension after a muscle is stimulated, which is primarily dependent on the concentration of calcium ions.
Hence, the correct answer is Calcium ion concentration (Option B).