Engines that do not have a water cooling system can not use a heater core; one alternative is to guide air around the (very hot) engine exhaust manifold and then into the vehicle's interior. Temperature control is achieved by mixing with unheated outside air.
1. A widening of the prevertebral soft tissue is often associated with injury to the cervical spine. Injury to the cervical spine may be accompanied by pre and/or paravertebral haematoma, which is radiographically demonstrated as an abnormal increase within the width of the prevertebral space [1] , [2] and [3] .his study was undertaken to explore the diagnostic value of prevertebral soft tissue swelling with special reference to the association of this sign with the presence and degree of cervical spine injuries.
Precapillary muscles are rings of smooth muscles at the start of true capillaries that handle blood flow into true capillaries and control blood flow through a body part or area. Physiology The capillary wall is a one-layer tissue so thin that gas and other items such as oxygen, water, proteins and fats can pass through them driven by pressure differences.