Which condition is characterized by stiffness or rigor in the body's muscles?

The condition characterized by stiffness or rigor in the body's muscles is indeed tetanus. Tetanus is caused by the bacterium Clostridium tetani, which produces a toxin affecting the nervous system, leading to muscle rigidity and spasms. This muscular stiffness arises because the toxin interferes with normal signaling from the nervous system to the muscles, resulting in sustained contraction.

In the context of sheep management, recognizing signs of tetanus is crucial, as it can affect their health and vitality. Immediate intervention is necessary for animals exhibiting these symptoms to prevent severe complications or death. Tetanus is often associated with wounds or infections, making it critical to maintain hygienic practices in sheep handling and care.

Other conditions mentioned, while related to different physiological issues, do not primarily manifest as muscle stiffness. Rhabdomyolysis involves the breakdown of muscle tissue but does not usually result in the sustained rigidity seen in tetanus. Anemia refers to a deficiency of red blood cells and does not relate to muscle stiffness. Protein deficiency can lead to weakness and other health issues, but it does not specifically cause muscle rigidity. Understanding these distinctions is key for effective sheep management and health monitoring.