334330
Each muscle is made up of fibres which are composed of numerous fine fibrils called
1 Myofibrils
2 Microtubules
3 Fibroblast
4 None of these
Explanation:
Each muscle is made of many long, cylindrical fibres arranged in parallel arrays. These fibres are composed of numerous fine fibrils, called myofibrils.
BIOXI07: STRUCTURAL ORGANISATION IN ANIMALS
334331
Intercalated discs are the communication junctions found in
1 Striped muscles
2 Myocardium
3 Striated muscles
4 Adipose tissue
Explanation:
Communication junctions (intercalated discs) at some fusion points are found in cardiac muscles which allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.
BIOXI07: STRUCTURAL ORGANISATION IN ANIMALS
334332
Which of the following statements is correct about the cardiac muscles? i. It is present in heart ii. The plasma membranes of adjacent cardiac cells interlock at intercalated disc iii. Gap junctions allow the cardiac cells to contract as a unit
1 i and ii only
2 ii and iii only
3 All
4 None
Explanation:
All the statements given about cardiac muscles are correct. Cardiac muscle tissue is a contractile tissue present only in the heart. Cell junctions fuse the plasma membranes of cardiac muscle cells and make them stick together . Communication junctions (intercalated discs) at some fusion points allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.
BIOXI07: STRUCTURAL ORGANISATION IN ANIMALS
334333
Which type of tissues change the diameter of a artery during vasodilatation and vaso constriction?
1 Smooth muscle
2 Epithelial
3 Skeletal
4 Nervous
Explanation:
When there is an increase in perfusion, the vascular smooth muscle stretches, causing it to constrict the artery. If there is a decrease in pressure to the arteriole, then there is decreased stretching of the smooth muscle, which would lead to the relaxation of the smooth muscles and dilation of the arteriole.
334330
Each muscle is made up of fibres which are composed of numerous fine fibrils called
1 Myofibrils
2 Microtubules
3 Fibroblast
4 None of these
Explanation:
Each muscle is made of many long, cylindrical fibres arranged in parallel arrays. These fibres are composed of numerous fine fibrils, called myofibrils.
BIOXI07: STRUCTURAL ORGANISATION IN ANIMALS
334331
Intercalated discs are the communication junctions found in
1 Striped muscles
2 Myocardium
3 Striated muscles
4 Adipose tissue
Explanation:
Communication junctions (intercalated discs) at some fusion points are found in cardiac muscles which allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.
BIOXI07: STRUCTURAL ORGANISATION IN ANIMALS
334332
Which of the following statements is correct about the cardiac muscles? i. It is present in heart ii. The plasma membranes of adjacent cardiac cells interlock at intercalated disc iii. Gap junctions allow the cardiac cells to contract as a unit
1 i and ii only
2 ii and iii only
3 All
4 None
Explanation:
All the statements given about cardiac muscles are correct. Cardiac muscle tissue is a contractile tissue present only in the heart. Cell junctions fuse the plasma membranes of cardiac muscle cells and make them stick together . Communication junctions (intercalated discs) at some fusion points allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.
BIOXI07: STRUCTURAL ORGANISATION IN ANIMALS
334333
Which type of tissues change the diameter of a artery during vasodilatation and vaso constriction?
1 Smooth muscle
2 Epithelial
3 Skeletal
4 Nervous
Explanation:
When there is an increase in perfusion, the vascular smooth muscle stretches, causing it to constrict the artery. If there is a decrease in pressure to the arteriole, then there is decreased stretching of the smooth muscle, which would lead to the relaxation of the smooth muscles and dilation of the arteriole.
334330
Each muscle is made up of fibres which are composed of numerous fine fibrils called
1 Myofibrils
2 Microtubules
3 Fibroblast
4 None of these
Explanation:
Each muscle is made of many long, cylindrical fibres arranged in parallel arrays. These fibres are composed of numerous fine fibrils, called myofibrils.
BIOXI07: STRUCTURAL ORGANISATION IN ANIMALS
334331
Intercalated discs are the communication junctions found in
1 Striped muscles
2 Myocardium
3 Striated muscles
4 Adipose tissue
Explanation:
Communication junctions (intercalated discs) at some fusion points are found in cardiac muscles which allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.
BIOXI07: STRUCTURAL ORGANISATION IN ANIMALS
334332
Which of the following statements is correct about the cardiac muscles? i. It is present in heart ii. The plasma membranes of adjacent cardiac cells interlock at intercalated disc iii. Gap junctions allow the cardiac cells to contract as a unit
1 i and ii only
2 ii and iii only
3 All
4 None
Explanation:
All the statements given about cardiac muscles are correct. Cardiac muscle tissue is a contractile tissue present only in the heart. Cell junctions fuse the plasma membranes of cardiac muscle cells and make them stick together . Communication junctions (intercalated discs) at some fusion points allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.
BIOXI07: STRUCTURAL ORGANISATION IN ANIMALS
334333
Which type of tissues change the diameter of a artery during vasodilatation and vaso constriction?
1 Smooth muscle
2 Epithelial
3 Skeletal
4 Nervous
Explanation:
When there is an increase in perfusion, the vascular smooth muscle stretches, causing it to constrict the artery. If there is a decrease in pressure to the arteriole, then there is decreased stretching of the smooth muscle, which would lead to the relaxation of the smooth muscles and dilation of the arteriole.
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BIOXI07: STRUCTURAL ORGANISATION IN ANIMALS
334330
Each muscle is made up of fibres which are composed of numerous fine fibrils called
1 Myofibrils
2 Microtubules
3 Fibroblast
4 None of these
Explanation:
Each muscle is made of many long, cylindrical fibres arranged in parallel arrays. These fibres are composed of numerous fine fibrils, called myofibrils.
BIOXI07: STRUCTURAL ORGANISATION IN ANIMALS
334331
Intercalated discs are the communication junctions found in
1 Striped muscles
2 Myocardium
3 Striated muscles
4 Adipose tissue
Explanation:
Communication junctions (intercalated discs) at some fusion points are found in cardiac muscles which allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.
BIOXI07: STRUCTURAL ORGANISATION IN ANIMALS
334332
Which of the following statements is correct about the cardiac muscles? i. It is present in heart ii. The plasma membranes of adjacent cardiac cells interlock at intercalated disc iii. Gap junctions allow the cardiac cells to contract as a unit
1 i and ii only
2 ii and iii only
3 All
4 None
Explanation:
All the statements given about cardiac muscles are correct. Cardiac muscle tissue is a contractile tissue present only in the heart. Cell junctions fuse the plasma membranes of cardiac muscle cells and make them stick together . Communication junctions (intercalated discs) at some fusion points allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.
BIOXI07: STRUCTURAL ORGANISATION IN ANIMALS
334333
Which type of tissues change the diameter of a artery during vasodilatation and vaso constriction?
1 Smooth muscle
2 Epithelial
3 Skeletal
4 Nervous
Explanation:
When there is an increase in perfusion, the vascular smooth muscle stretches, causing it to constrict the artery. If there is a decrease in pressure to the arteriole, then there is decreased stretching of the smooth muscle, which would lead to the relaxation of the smooth muscles and dilation of the arteriole.
