Tag: muscle tissues

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Questions Related to muscle tissues

Multiple choice biology multicellular structure: tissue muscle tissue structure of protein muscle tissues

Unstriated muscles are found in

  1. Veins

  2. Arteries

  3. Uterus

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Smooth muscles are the muscle tissues that contracts without conscious control (involuntary), having the form of thin layers or sheets. It is made up of spindle-shaped, unstriated cells with single nuclei and found in the walls of the internal organs such as stomach, uterus, bladder, intestine and blood vessels (veins, arteries) except for heart.
Thus, the correct answer is option D.

Multiple choice bio-chemistry proteins muscle tissue structure of protein muscle tissues

An example of structural protein is

  1. Myosin

  2. Collagen

  3. Keratin

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Structural proteins are fibrous proteins and form the largest class of proteins measured in terms of their total mass. Structural proteins include myosin, collagen, and keratin. 

Keratins form the protective covering like skin, hair, fur, wool, etc. in all land vertebrates. Equally widespread are the actin and myosin proteins of muscle tissue that play a major role in body movements. In addition, there are the collagens of tendons and hides, which form connective ligaments within the body.
Thus, the correct answer is option (D), 'All of the above'.

Multiple choice biology multicellular structure: tissue muscle tissue structure of protein muscle tissues

Phosphagen in vertebrates is

  1. Phospho creatine

  2. Phospho arginine

  3. ATP

  4. Phosphoric acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The phosphagens are energy storage compounds, also known as high-energy phosphate compounds. They are chiefly found in muscular tissue in animals. ATP molecules can provide energy for only a few seconds of strenuous muscular activity. Thus muscle cells have backup energy storage compound, creatine phosphate, that can be stockpiled. The energy stored in creatine phosphate is transferred to ATP as needed. But during vigorous exercise, the supply of creatine phosphate is quickly depleted. Muscle cells must replenish their supplies of these energy-rich compounds. Chemical energy is stored in muscle fibers in glycogen, a large polysaccharide formed from hundreds of glucose molecules. Glycogen can be degraded, yielding glucose, which is then degraded in cellular respiration. When sufficient oxygen is available, enough energy is captured from glucose to produce needed quantities of ATP and creatine phosphate.

Multiple choice biology multicellular structure: tissue muscle tissue structure of protein muscle tissues

Red muscle fibres are present over

  1. Extensors of backs

  2. Flight muscle of birds

  3. Athletes of marathon race

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Three major types of skeletal muscle fibers have been identified in vertebrates: slow-oxidative, fast-oxidative, and fast-glycolytic. Slow-oxidative fibers are specialized for endurance activities such as swimming, running long distances like the marathon, or maintaining posture. They contract slowly and fatigue slowly. These fibers require a steady supply of oxygen. They derive most of their energy from aerobic respiration and are rich in mitochondria and capillaries. Slow-oxidative fibers are rich in myoglobin, a red pigment similar to hemoglobin in red blood cells, which stores oxygen. Myoglobin enhances rapid diffusion of oxygen from blood into muscles during strenuous muscle exertion. Because of the myoglobin, slow-oxidative fibers are red. Birds that fly have red breast muscles specialized to support sustained activity. In humans, the proportions of slow-oxidative and fast-oxidative fibers vary among individuals and from muscle to muscle in the same person.

Multiple choice biology multicellular structure: tissue muscle tissue structure of protein muscle tissues

One myosin filament in the myofibril of skeletal muscle fibre is surrounded by how many actin filaments?

  1. Two

  2. Four

  3. Six

  4. Three
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Six actin filaments surround each myosin filament and the active sites of an actin filament are available to three different myosin filaments in the myofibril of skeletal muscle fibre.

Multiple choice biology animal tissue muscle tissue structure of protein muscle tissues

The type of muscle present in our 

  1. Heart is Involuntary and unstriated smooth muscle

  2. Intestine is striated and involuntary

  3. Thigh is striated and voluntary

  4. Upper arm is smooth muscle and fusiform in shape
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Thigh muscles are skeletal muscles, which are striated and under voluntary control.

Multiple choice biology animal tissue muscle tissue structure of protein muscle tissues

In heart cells, which one serves as a second messenger, speeding up muscle cell contraction in response to adrenaline _____________.

  1. cAMP

  2. cGMP

  3. GTP

  4. ATP

  5. AMP
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In cardiac muscle cells, adrenaline binds to beta-adrenergic receptors, activating adenylate cyclase to produce cAMP, which acts as a second messenger to increase contraction rate and force.