Q5. How do intercalated discs help coordinate cardiac muscle, and do all heart chambers contract at once?
Intercalated discs mechanically connect cells and contain gap junctions for electrical coupling. They support coordinated contraction, but atria and ventricles contract in sequence, not all chambers simultaneously (NCERT Chapter 15, cardiac cycle).
Q6. Name three cell types found in areolar tissue.
Fibroblasts, macrophages and mast cells.
Q7. In which tissues are cells found in small cavities called lacunae?
In cartilage and in bone.
Q8. What are the three main parts of a neuron, according to NCERT?
The cell body, the dendrites and the axon (NCERT Chapter 18, page 231).
Q9. What lines the proximal convoluted tubule of the nephron?
Simple cuboidal brush border epithelium, which increases the surface area for reabsorption (NCERT Chapter 16, page 209).
Q10. Which proteins make up the fibres of connective tissue?
Collagen and elastin.