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.
Also present, just underneath the epithelium of blood capillaries, are cells called Pericytes - (perivascular cells-peri is greek for 'around), which can divide and provide a source of new fibroblasts, especially following tissue injury. Finally, smooth muscle is commonly found in connective tissue.For example, in regions of connective tissue where there are glands, smooth muscle cells called myo-epithelial cells, which lie between epithelial cells and the basement membrane of ducts, are found.The type of connective tissue shown in this photograph on the right is is a type of loose connective tissue.pecialised connective tissue includes tendons and ligaments, Bone and Cartilage, haemopoetic tissue, blood and adipose tissue. Bone contains Osteocytes, and osteoblasts (osteo-bone) which secrete the type of extracellular matrix material (ECM) that makes up bone.