She takes the deepest breath she can then blows it all out. Sometimes she holds her breath for a short time then tries to pack more air in. She keeps doing that until she can`t squeeze any more in. Heart beat recorded with the steth.
Description
She takes the deepest breath she can then blows it all out. Sometimes she holds her breath for a short time then tries to pack more air in. She keeps doing that until she can`t squeeze any more in. Heart beat recorded with the steth.