Do I have to know all my private keys for sending a "big" amount?

Do I have to know all my private keys for sending a "big" amount?

As I understood it: My client creates a public key (for recieving) and a private key (for accessing) for each transaction.

And the private key is here that I can send the BTCs I recieved (for all transactions only handled by this same public and private key pair where this private key is the private key).

But what if I want to send a big amount of BTCs but I only have recievied many small amounts? Would I then have to mention each private key for each transaction that I can send this big amount?

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