What is the last value in a cipher suite?
HMAC is the underlying primitive used to construct the PRF. The cryptographic hash is used to construct the HMAC.

It is (at least) used to derive the session keys. The only thing that changes is that records that transport the data do not rely on the HMAC function anymore.

The PRF (and therefore the underlying HMAC) has one configuration parameter: the underlying hash function. This is what is specified at the end of the ciphersuite.