Moments later, the head of a beluga calf emerged, mouth agape in what looked like a smile. Jacobsma's face lit up in response as he cooed to the calf like a human parent to a toddler. Shedd’s ...

Muscle is a soft tissue composed of elongated cells (muscle fibres) that produce force and motion through contraction. Involuntary cardiac and smooth muscles are responsible for contraction of the ...