Nursing is an intellectually stimulating profession which attracts those interested in caring for others. To be effective, a nurse combines the art of caring with the science of nursing. Nursing focuses not only on particular health problems, but on the whole client and his/her response to treatment. Registered Nurses are licensed professionals practicing according to the standards and ethics and within the laws and regulations that apply to the profession. Nurses assume many different roles and functions in health care, from providing direct care to managing large institutions. Along with their own professional practice, Registered Nurses are also responsible for the performance and professional behavior of those they supervise and to whom they delegate aspects of patient care.