These are locks and holds of the semi-voluntary and involuntary muscles in the body. They decongest the vital organs, improve circulation and nutrition by pressure manipulations and contribute to general health and emotional stability. A difference is made between the Bandhas and Mudras on the basis of their use in Pranayama. Mudras that are used in Pranayama are usually called Bandhas because they bind and channelise a particular nervous activity in a particular place or direction. Jalandhara, Uddiyana and Mula are important Bandhas. Some Asanas are called Mudras because of their specific and channels through which the effect are brought.