Home
Class 12
BIOLOGY
Assertion: Vigorous contraction of the u...

Assertion: Vigorous contraction of the uterus at the end of pregnancy causes expulsion.
Reason: The stimulatory reflex between the uterine contraction and oxytocin secretion results in weakening contractions.

A

(1) X - Vagina , Y - Fertilisation

B

(2) X - Uretrus , Y - Pregnancy

C

(3) X - Placenta, Y - Implantation

D

(4) X - Embryo , Y - Ovulation

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • BIOLOGY AT A GLANCE

    ALLEN|Exercise Ecology|62 Videos

  • BIOLOGY IN HUMAN WELFARE (DOMESTICATION OF PLANTS & ANIMALS)

    ALLEN|Exercise Exercise-IV (Assertion & Reason)|8 Videos

Similar Questions

Explore conceptually related problems

Oxytocin responsible for vigorous contraction of uterus at the time of child birth is synthesize by:-

The hormone through autocatalytic secretion useful in stronger uterine muscle contractions.

In females, vigorous contraction of uterus at the time of child birth and milk ejection from the mammary gland is due to

Oxytocin, a peptide hormone from hypothalamus, has all the following effects except A. Stimulates vigorous contractions of the uterus at the time of child birth B. Its hypersecretion causes Cushing's syndrome C. Stimulates milk ejection from mammary glands D. Its synthetic form is often given to induce labor

Given below are the steps involved in parturition. Arrange them in proper sequence and select the correct option. I. The induction of mild uterine contractions is called foetal ejection reflex. II. Stronger uterine contractions causing the further release of oxytocin. III. Origination of signals from the fully developed foetus and placenta. IV. Release of oxytocin from maternal pituitary V. Expulsion of baby from the birth canal (a) III , IV , I , II , V (b) III, I , IV , II , V (c) I, III , II , IV ,V (d) II , IV , III, I,V

Assertion : The melting point of ice decreases with increase of pressure Reason : Ice contract on melting.

Assertion : Contraction of a muscle fibre takes place by the sliding of the thin filaments over the thick filaments. Reason : The central part of thick filament is not overlapped by thin filaments in a resting state.

Assertion: Parturition is induced by neural signal in maternal pituitary. Reason: At the end of gestation period, the maternal pituitary releases prolactin which causes uterine contractions.

Assertion : The contraction and relaxation of muscle fiber are controlled by nerve impulses. Reason : The threshold stimulus is the minimum stimulus required for the beginning of contraction.

Which of the following endocrine glands is responsible for the release of hormones which cause uterine contractions during childbirth ?

ALLEN-BIOLOGY AT A GLANCE (ZOOLOGY )-EXERCISE
  1. is a sticky white or yellow fluid secreted by the breasts during the s...

    Text Solution

    |

  2. Which of the following is not a paired structure in male

    Text Solution

    |

  3. Assertion: Vigorous contraction of the uterus at the end of pregnancy ...

    Text Solution

    |

  4. Fertilization can only occurs if :-

    Text Solution

    |

  5. Match these columns with regards to innate immunity :

    Text Solution

    |

  6. Find out the correct matching of disease,pathogen and mode of transmis...

    Text Solution

    |

  7. Read the following statement (A-D) (A) Haemophilus influenzae infec...

    Text Solution

    |

  8. Withdrawal syndrome is characterized by (i) Anxiety (ii) Violence...

    Text Solution

    |

  9. Choose the incorrect statement from given below:

    Text Solution

    |

  10. Which one of the following statement is incorrect?

    Text Solution

    |

  11. Consider the given statements and select the true ones. (a) health ...

    Text Solution

    |

  12. How many diseases are caused by bacteria? Common cold, Pneumonia, Mala...

    Text Solution

    |

  13. Select the symptoms of the disease caused by round worm

    Text Solution

    |

  14. which of the following disease is caused by protozoans?

    Text Solution

    |

  15. Identify the correct option.

    Text Solution

    |

  16. Which of the following option is correct for cancer?

    Text Solution

    |

  17. Which of the following option is true for opioids

    Text Solution

    |

  18. Choose the incorrect option

    Text Solution

    |

  19. Match the following columns and choose the correct answer from the opt...

    Text Solution

    |

  20. Which of the following option properly define innate immunity?

    Text Solution

    |