Question

Describe the structure of cardiac muscle fibres with diagram.
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Answer 1

Cardiac muscle is striated muscle that is present only in the heart. Cardiac muscle fibers have a single nucleus, are branched, and joined to one another by intercalated discs that contain gap junctions for depolarization between cells and desmosomes to hold the fibers together when the heart contracts.

Answer 2

Cᴀʀᴅɪᴀᴄ ᴍᴜsᴄʟᴇ ɪs sᴛʀɪᴀᴛᴇᴅ ᴍᴜsᴄʟᴇ ᴛʜᴀᴛ ɪs ᴘʀᴇsᴇɴᴛ ᴏɴʟʏ ɪɴ ᴛʜᴇ ʜᴇᴀʀᴛ. Cᴀʀᴅɪᴀᴄ ᴍᴜsᴄʟᴇ ғɪʙᴇʀs ʜᴀᴠᴇ ᴀ sɪɴɢʟᴇ ɴᴜᴄʟᴇᴜs, ᴀʀᴇ ʙʀᴀɴᴄʜᴇᴅ, ᴀɴᴅ ᴊᴏɪɴᴇᴅ ᴛᴏ ᴏɴᴇ ᴀɴᴏᴛʜᴇʀ ʙʏ ɪɴᴛᴇʀᴄᴀʟᴀᴛᴇᴅ ᴅɪsᴄs ᴛʜᴀᴛ ᴄᴏɴᴛᴀɪɴ ɢᴀᴘ ᴊᴜɴᴄᴛɪᴏɴs ғᴏʀ ᴅᴇᴘᴏʟᴀʀɪᴢᴀᴛɪᴏɴ ʙᴇᴛᴡᴇᴇɴ ᴄᴇʟʟs ᴀɴᴅ ᴅᴇsᴍᴏsᴏᴍᴇs ᴛᴏ ʜᴏʟᴅ ᴛʜᴇ ғɪʙᴇʀs ᴛᴏɢᴇᴛʜᴇʀ ᴡʜᴇɴ ᴛʜᴇ ʜᴇᴀʀᴛ ᴄᴏɴᴛʀᴀᴄᴛs.

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