Question

write 2 difference for the following
a. cardiac Muscles and smooth muscles.
b. Actin and myosin.
c. Red muscle fibres and white muscles fibres.
d. pectoral girdles and pelvic girdles
e. fibrous joints and Synovial joints.​

Answer 1

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a. Difference between cardiac Muscles and smooth muscles

➝ Cardiac Muscles :-

• They are found only in the wall of the heart.
• Striation are faintly seen.
• cell are cylindrical and branched.
• Intercalated doc's are present.

➝ Smooth muscles :-

• They are found in the wall of vicsceral organs like alimentary canal, uterus, ureters, etc.
• Striation are absent.
• Cells are spindle shaped.
• Intercalated discs are absent.

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b. Difference between actin and myosin

➝ Actin :-

• It is the thin protein of a sarcomere or myofibril
• It forms the light band or isotropic band.

➝ Myosin :-

• It is the thick protein of a sarcomere/myofibril
• It forms the dark band or anisotropic band

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c. Difference between Red Muscle fibres and white muscle fibres

➝ Red Muscle fibres :-

• They have large quantity of myoglobin that gives the red colour.
• They have a number of Mitochondria and blood capillaries.
• Sarcoplasmic reticulum is less.
• These muscle fibres are thinner.

➝ White muscle fibres :-

• They have very little amount of myoglobin hence are not red in colour.
• They have less number of Mitochondria and blood capillaries.
• Sarcoplasmic reticulum is more.
• These muscle fibres are thicker.

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d. Difference between of pectoral girdles and pelvic girdles

➝ Pectoral girdles :-

• This helps in the attachment of forelimb bones.
• Each half is made of two bones, clavicle and scapula.
• The head of humerus articulates with glenoid cavity.

➝ Pelvic girdles :-

• This helps in the attachment of hind-limb bones.
• Each half is made of there bones , ilium, ischium and pubis fused together as one coxal bone.
• The head of femur articulate with acetabulum.

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e. Difference between fibrous joints and Synovial joints.

➝ Fibrous joints :-

• These are fixed joints, i.e., there is no movement allowed
• Bones are joined together by white fibrous connective
• Examples :- Skull bones.

➝ Synovial joints :-

• These joints allow limited movements.
• Bones are joined with cartilage.
• Examples :- Shoulder joint, hip Joints.