Biology Human Body

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Nitric oxide is synthesized in the human body and acts as a vasodilator, meaning it dilates blood vessels and increases blood flow. This helps in regulating blood pressure and improving circulation to various tissues and organs.

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The correct answer is option (d), which means that all three statements are true. Capillaries are the smallest blood vessels and are one-cell thick. All mammals have a heart with four chambers. During blood clotting, fibrinogen is converted into fibrin.

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The correct statement is number 2. In open heart surgery, the heart's function is supported artificially but not replaced entirely. Mammography is a method used for detecting breast cancer, not stomach cancer.

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In the human body, the common bile duct does not release its contents into the stomach but into the duodenum. On the other hand, the pancreatic duct releases its contents into the duodenum. Therefore, the correct statement is: 2 only.

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In the given statements, it is mentioned that the ELISA test is used as the initial test for detecting cancer in individuals, and that approximately 50% of humans have Rh+ blood while the rest have Rh- blood. However, the correct information is that ELISA is not primarily used for cancer detection, and around 85% of people have Rh+ blood, not 50%. Therefore, neither statement 1 nor statement 2 is correct.

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The vessel that transports nutrient-rich blood from the stomach and small intestine to the liver is known as the hepatic portal vein.

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Proteins in our food are not completely digested in the small intestine alone, contrary to Assertion (A). The correct reason (R) is that protein-digesting enzymes from the pancreas are indeed released into the small intestine.

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In the case of Diabetes insipidus, the individual experiences excessive thirst (Assertion A is true) because of a lack, not an overabundance, of vasopressin secretion (Reason R is false).

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The Cowper's glands, also known as bulbourethral glands, are a component of the male reproductive system.

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Insulin is a type of hormone made up of amino acids, known as a peptide hormone.

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Lymphocyte cells are produced in the bone marrow, which includes long bones, as well as in various lymphoid organs.

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Gastrin is not a digestive enzyme in the human system; it is a hormone that triggers the secretion of acid. Trypsin, ptyalin, and pepsin are examples of digestive enzymes present in the human digestive system.

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In the human digestive system, Gastrin is not a digestive enzyme but a hormone that triggers acid secretion. Trypsin, Ptyalin, and Pepsin are examples of digestive enzymes in the human body.

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In order to determine a person's blood group, it is necessary to test their blood with both Anti-A and Anti-B sera.

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In the human body, the hormone testosterone is produced by the testes, not the ovary. Similarly, the hormone progesterone is secreted by the ovary, not the testis. Adrenaline is released by the adrenal glands. The correct pair in the given options is (d) Adrenaline: Adrenal.

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Drinking whisky can indeed lead to more frequent urination (Assertion is true). However, it is not accurate to say that alcohol speeds up the secretion of vasopressin in the body (Reason is false).

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The reason why cornea grafting is typically successful is because the cornea does not have blood vessels. Generally, blindness is often a result of the dry and hardening of the cornea, which lacks blood vessels.

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Adrenaline is a hormone that is released in the body to help cope with feelings of anger, fear, and danger.

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In the process of eye donation, the only part of the eye that is transplanted from the donor to the recipient is the cornea. This is the clear, front part of the eye.

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In this question, you are asked to match substances in List-I with their corresponding physiological roles in List-II. Ptyalin is responsible for digesting starch, Pepsin digests proteins, Renin converts angiotensinogen into angiotensin 2, and Oxytocin induces the contraction of smooth muscles. The correct match is A – 2; B – 3; C – 1; D – 5, as indicated by option (a).

Explanation

In this biology question, you are asked to match specific bones with their correct names. The breast bone corresponds to the sternum, the collar bone to the clavicle, the knee cap to the patella, and the shoulder blade to the scapula. The correct matching of these bones to their names is: Breast-bone (A) - Sternum (4), Collar-bone (B) - Clavicle (1), Knee-cap (C) - Patella (2), Shoulder blade (D) - Scapula (3). Therefore, the correct answer is option (a): A-4, B-1, C-2, D-3.

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The parathyroid gland can operate without the influence of the pituitary gland and is responsible for regulating calcium levels in the body by producing parathormone.

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The first recorded achievement among the options given is plastic surgery, which dates back to the year 1827. This predates the other medical advancements listed: organ transplant in 1954, bypass surgery in 1960, and test tube baby technology in 1978.

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The parathyroid gland is able to function independently of the pituitary gland. It secretes parathormone, which plays a role in regulating calcium levels in the body.

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When ants bite, they inject an acidic liquid into the skin. The correct option is (a) an acidic liquid.

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The primary element found in hemoglobin is iron. This distinguishes it from other elements like chlorine, calcium, and sodium.

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In the human body, which organ utilizes the most oxygen? (a) Heart (b) Kidney (c) Liver (d) Lung. The correct answer is (b) Kidney. Oxygen enters the body through the lungs and is transported to various tissues via the blood. The kidney is the organ that consumes the highest amount of oxygen in the human body.

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The corpus luteum is a cluster of cells located in the ovary. It is responsible for the production of the hormone progesterone.

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Alpha-keratin is a type of protein that can be found in the skin, hair, nails, claws, and hooves of animals.

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The blood vessels that deliver blood to the heart are known as coronary arteries. In contrast, carotid arteries supply blood to the head region.

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The body temperature of a healthy individual is around 37 degrees Celsius. When this is converted to the Kelvin scale by adding 273, it is approximately 310 Kelvin. Therefore, the correct answer is option (c) 310.

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The layer of fat beneath our skin serves as a protective barrier against the loss of body heat.

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A person with blood group 'AB' is often referred to as a universal recipient because individuals with this blood type do not have antibodies present in their blood plasma. This lack of antibodies allows them to receive blood from donors with different blood types without triggering an immune response.