Phosphorus deficiency. 1  Symptoms: Slow growth and dull yellow foliage. 2  Cause: Phosphorus is needed for healthy roots and shoot growth. 3  Soil shortages of phosphorus are rare, but may occur in areas with high rainfall and heavy clay soil. 4  Remedy: Apply fertilisers such as superphosphate or bone meal.
Smooth muscle is an involuntary non-striated muscle. It is divided into two subgroups; the single-unit (unitary) and multiunit smooth muscle. Within single-unit cells, the whole bundle or sheet contracts as a syncytium (i.e. a multinucleate mass of cytoplasm that is not separated into cells).mooth muscle is found within the walls of blood vessels (such smooth muscle specifically being termed vascular smooth muscle) such as in the tunica media layer of large (aorta) and small arteries, arterioles and veins.
Types of Smooth Muscle. Single-unit (unitary) smooth muscle, called visceral muscle, is the most common type of smooth muscle. It contracts rhythmically as a unit, is electrically coupled by gap junctions, and exhibits spontaneous action potentials.verview of Muscle Tissues. Types of Muscle Tissue. Skeletal muscle is associated with the bony skeleton, and consists of large cells that bear striations and are controlled voluntarily. Cardiac muscle occurs only in the heart, and consists of small cells that are striated and under involuntary control.