Practice free Locomotion and Movement (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
ATP-ase needed for muscle contraction is present over ( C.B.S.E.-2004)
ATP-ase needed for muscle contraction is present in the myosin heads. During muscle contraction, ATP binds to myosin, which is then hydrolyzed by ATP-ase to provide the energy necessary for the myosin heads to attach to actin filaments and produce a contraction.
And R type question option for question number Statement (A) : In skeleton muscle horizontal belts are arranged in line. Reason (R) : Skeleton muscle is also called striated muscle.
Both the statements are true and Reason (R) is the correct explanation for Assertion (A). Skeletal muscles are also called striated muscles because they have a banded appearance due to the arrangement of actin and myosin filaments in repeating units called sarcomeres, which form horizontal belts.
And R type question option for question number Statement (A) : The contraction of cardiac muscle is Quick, rhythmic, powerful and never get fatigue Reason (R) : Intercalated disc is absence in cardiac muscle.
Statement (A) is true as cardiac muscles contract quickly, rhythmically, and powerfully, and they do not fatigue easily. However, Reason (R) is false because intercalated discs are present in cardiac muscle. These discs contain gap junctions that facilitate the synchronized contraction of cardiac muscle cells.
And R type question option for question number Statement (A) : In human 12 pairs of ribs are present. Reason (R) : The ribs have two articulation surfaces it is called bicephalic.
And R type question option for question number Statement (a) : The anterior region go glenoid cavity and humerus joint form joint of shoulder. Reason (R) : The joint of shoulder is ball and socket joint.
The glenoid cavity of the scapula and the head of the humerus form the shoulder joint, which is indeed a ball and socket joint. Thus, both statements A and R are true, and R is the correct explanation for A.
And R type question option for question number Statement (a) : The joints of skull are immovable. Reason (R) : The bones of skull are joint with each other by strong collagen fibers.
The joints in the skull are immovable, known as sutures, and they are joined together by strong collagen fibers. Hence, both statements A and R are true, and R is the correct explanation for A.
In which type of reproduction two individual of opposite sexare essential?
In reference to biological role, Ca2+ ions are important in
Calcium ions (Ca2+) are key second messengers in a variety of eukaryotic cell signaling pathways, and they function in the regulation of diverse cellular processes. While it has become clear that Ca2+ stimulates many cellular processes, such as muscle contraction, cellular proliferation, gene expression, secretion of hormones and neurotransmitters, exocytosis, and chemotaxis,
Which of the following is not a cranial bone?
Read page 309, Figure 20.6, XI NCERT
The human ribs are termed as bicephalic because:
Answer: 2
Read page 310, XI NCERT
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