If the pace maker is absent - Vidyadip

MCQ

If the pace maker is absent

A
Only auricles will contract
B
Only ventricles will contract
C
Cardiac muscles will contract in a coordinated manner
✓
Cardiac muscles will not contract in a coordinated manner

✓

Answer

Correct option: D.

Cardiac muscles will not contract in a coordinated manner

d
(d) Because pace maker of the heart is capable of initiating and regulating the heart beat.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

NEET STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Statement I: In testis, the immature male germ cells called spermatogonia produce sperms.
Statement II: Spermatogenesis begins at embryonic stage.

Which of the following can be used as an industrial pollution indicator?

Movement is one of the significant features of living beings. Which of the following statements are correct for movement ?
(i) Streaming of protoplasm in the unicellular organisms like Amoeba is a simple form of movement.
(ii) Movement of cilia, flagella and tentacles are shown by many organisms.
(iii) Human beings can move limbs, jaws, eyelids, tongue, etc., are not consider as movement.
(iv) Some of the movements result in a change of place or location.
(v) Change of place or location is a voluntary movements are called locomotory movements.
(vi) Walking, running, climbing, flying, swimming are all some forms of locomotory movements.

Hydra can use its tentacles for

Assertion: Every 100 ml of oxygenated blood can deliver around 4 ml of O, to the tissues under normal physiological conditions.
Reason: Every 100 ml of deoxygenated blood delivers approximately 5 ml of CO, to the alveoli.

Read the following and choose the correct option with incorrect statements.
(A) Calciferous gland is present in intestine of earthworm to neutralise the humic acid present in humus.
(B) In earthworm, after 26 segment there is presence of internal median fold of ventral wall called typhlosole that increase effective area of absorption.
(C) Blood glands in earthworm are present in 4, 5 & 6 segments.
(D) The excretory organs present in earthworm is called nephridia.
(E) Integumentary nephridia forms forests of nephridia in clitellar region.
(F) There is 1 pair of heart in earthworm.
(G) There are 2 pair of testis in earthworm which are present in 11- & 12 segments.
(H) Spermathecae receive and store spermatozoa during copulation in female earthworm.
(I) Fertilisation in earthworm occur within the cocoon and development is indirect.
(J) On an average, each cocoon produces 4 baby earthworm.
(K) The scientific name of common cockroach is Periplaneta americana
(L) In each segment of cockroach, exoskeleton has hardened plates called sclerites.
(M) Ventrally, sclerite is called tergites and dorsally it is called sternites and are joined to each other by arthrodial membrane.
(N) The mouth part of cockroach is biting and chewing type.
(O) The first pair of wings arises from mesothorax and second pair from metathorax in cockroach.

Geno typic and phenotypic ration in the offspring is $1:2:1$ it explain the principle of

Antihistamine pills are to nullify

Assertion: Each kidney has nearly one million complex tubular structures called nephrons, which are the functional units.
Reason: Nephrons begins with a double walled cup- like structure called Bowman's capsule, which encloses the glomerulus.

The secretion of glucagon causes