Cardiac muscle is striated, branched, and involuntary, with intercalated discs containing gap junctions for synchronized contraction. It is unique to the heart wall. Smooth muscle is non-striated and involuntary in visceral organs, skeletal muscle is striated and voluntary. Cardiac muscle exhibits autorhythmicity.
Explanation:
The corpus callosum is a thick band of nerve fibers that connects the left and right cerebral hemispheres, allowing interhemispheric communication. The thalamus is a sensory relay station, hypothalamus regulates homeostasis, pons is part of the brainstem. Severing the corpus callosum results in split-brain syndrome.
Explanation:
The Chipko movement, initiated in the 1970s in Uttarakhand (India), involved villagers (mainly women) hugging trees to prevent them from being cut down by contractors. It was a non-violent protest for forest conservation and sustainable use. Sunderlal Bahuguna was a prominent leader. It raised awareness about deforestation and environmental protection.
Explanation:
The common cold is a viral infectious disease of the upper respiratory tract. While many viruses can cause it, Rhinoviruses are the most common causative agents, responsible for 30-50% of cases. Coronaviruses and adenoviruses can also cause colds. Influenza virus causes the flu, which is a more severe respiratory illness.
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