Factors Affecting Development
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Consider the following statements regarding the various organs, systems, and hormonal and chemical control processes in the human body:
- 1. The 'pacemaker' (Sinoatrial Node or SA Node) in the human body is located on the wall of the right atrium, which spontaneously excites to generate electrical impulses and controls the contraction of heart muscles.
- 2. The Pancreas is a mixed gland whose 'beta cells' of the Islets of Langerhans secrete insulin, while 'alpha cells' secrete glucagon, which helps balance sugar levels in the blood.
- 3. The Nephron is the structural and functional unit of the Kidney, in which ultra-filtration of blood takes place through Bowman's capsule and glomerulus, and the Loop of Henle is mainly responsible for the concentration of urine.
- 4. The 'hypothalamus' part of the human brain is the major center for regulating hunger, thirst, temperature control, and hormones secreted by endocrine glands, while the Cerebellum controls body balance and voluntary muscle movement.
Which of the above statement(s) is/are completely true?
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Detailed Explanation
Various systems work together in a coordinated manner in the human body. All the given statements are completely true: 1. The Sinoatrial Node (SA Node) is called the natural pacemaker of the heart, located at the upper corner of the Right Atrium, and initiates heartbeat. 2. The beta cells of the islets of Langerhans in the pancreas secrete insulin and alpha cells secrete glucagon, which regulate blood sugar. 3. The nephron is the smallest unit of the kidney where the loop of Henle plays an important role in water reabsorption and urine concentration. 4. The hypothalamus is the center for body temperature, hunger, thirst, and pituitary gland control, and the cerebellum maintains balance.
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