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Chemical Coordination and Integration Test 23

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Chemical Coordination and Integration Test 23
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  • Question 1
    1 / -0
    Stimulation of RBC production is by the hormone 
    Solution
    Erythropoietin is a hormone produced by the kidney that leads to the formation of red blood cells(RBC) in the bone marrow. Its major function is to enable the differentiation and development of red blood cells and to initiate the production of hemoglobin. Thus the correct answer is option C.
  • Question 2
    1 / -0
    In a mammalian testis the number of lobules(conical compartments) are.
    Solution
    The correct option is C.
    The glandular structure of the testis consists of numerous lobules. Their number, in a single testis, is estimated by Berres at 250, and by Krause at 400.
  • Question 3
    1 / -0
    When a person suffers from a marked fall in blood pressure, it is helpful to administer to him the following hormone 
    Solution

    The hormones adrenaline (epinephrine) and norarenaline (norepinephrine), secreted by the adrenal medulla, have the same effect as the sympathetic stimulation, i.e. they increase the heart rate.
    Together they potentiate the fight and flight response by:
    1)  Increasing blood pressure
    2) Increasing heart rate
    3) Increasing metabolic rate
  • Question 4
    1 / -0
    Testis is covered by.
    Solution
    The correct option is C.
    The multi-layered tunica covers the testes, It facilitate blood supply to the testes and creates a partition between sperm producing regions of the testes. There are three layers to the tunica, the tunica vasculosa, tunica albuginea and tunica vaginalis.
  • Question 5
    1 / -0
    Graafian follicle is found in.
  • Question 6
    1 / -0
    More men suffer from colour blindness than women because
    Solution
    Colorblindness is an X- linked recessive disorder.  Men are hemizygous which means they have a single copy of X chromosome(X$$^{c}$$Y). Hence they are color blind even with the presence of a single copy of X chromosome. Females with two copies of the affected gene have the disease (X$$^{c}$$X$$^{c}$$). A female with a single copy of the affected gene will be a carrier. Thus the correct answer is option D.
  • Question 7
    1 / -0
    Refer the following features.
    I.   Adenohypophysis produces gonadotropins.
    II.  Besides Sex cells, hormones are also produced by testis and ovary.
    III. Testosterone is produced by Leydig's cells.
    IV. Oestrogen is produced by the ovary.
    Which of the above factors influence secondary sexual characters?
    Solution
    Secondary sexual characters are caused by the male and female hormones Testosterone and Oestrogen respectively.
    The adenohyphophysis or the pituitary gland produces gonadotropins (FSH and LH) which stimulate the male and female reproductive organs to produce hormones. In females, they are responsible for the production of oestrogen and progesterone which control the menstrual cycle and also are responsible for the secondary sexual characters during puberty.
    In males, FSH stimulates the formation of spermatozoa and LH stimulates the Leydig cells to produce testosterone, the male hormone.
    So, the correct answer is option D.
  • Question 8
    1 / -0
    In mammals, the ovary is attached to abdominal wall by.
  • Question 9
    1 / -0
    Which of the following is both hormone and enzyme?
    Solution
    • Renin is a hormone produced by the juxtaglomerular cells of the kidney.
    • Renin also acts as an enzyme in the conversion of angiotensin-1 to its active form, angiotensin-2 involved in constriction of blood vessels. Hence renin is both a hormone and an enzyme. Hence, renin is both a hormone and enzyme.
    So, the correct answer is 'renin'.
  • Question 10
    1 / -0
    Which one of the following is incorrectly matched?
    Solution
    • Renin, also known as an angiotensinogenase, is an aspartic protease protein.
    • This enzyme is secreted by the kidneys that participate in the body's renin–angiotensin–aldosterone system (RAAS)  that mediates the volume of extracellular fluid (blood plasma, lymph and interstitial fluid), and arterial vasoconstriction. 
    • Thus, it regulates the body's mean arterial blood pressure. Hence, renin is not secreted by the liver.
    So, the correct answer is 'Renin- Liver'.
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