Tag: evs

Questions Related to evs

Which muscles move the fore limb?

evs the muscular system and digestive system in human beings human muscular system closer look into muscular system muscles and its types

  1. Brachialis

  2. Latis simus dorsi

  3. Dorsal scapularis

  4. Triceps brachii

Show answer
Correct Option: A
Explanation:

The brachialis is a muscle in the upper arm that flexes the elbow joint.
The Latissimus dorsi is the larger, flat, dorsolateral muscle on the trunk, posterior to the arm.
The dorsal scapular is the nerve that is the right brachial plexus with its short branches, viewed from in front.
Triceps brachii is that large muscle on the back of the upper limb and is principally responsible for extension of the elbow joint (straightening of the arm).
Therefore, the correct answer is option A.

The cycle of reactions by which muscle lactic acid is transformed to muscle glycogen is known as

evs the muscular system and digestive system in human beings human muscular system closer look into muscular system muscles and its types

  1. Glycolactic cycle

  2. Glycolysis

  3. Cori cycle

  4. Krebs cycle

Show answer
Correct Option: C
Explanation:

The Cori cycle (also known as lactic acid cycle), refers to the metabolic pathway, in which lactate produced by anaerobic glycolysis in the muscles moves to the liver and is converted to glucose, which then returns to the muscles and is metabolised back to lactate.

Blood glucose level is not dependent upon muscle glycogen, because of the absence of 

evs skeleton and muscular systems human muscular system closer look into muscular system muscles and its types

  1. Phosphorylase

  2. Branching enzyme

  3. Glucose-6-phosphatase

  4. Aldolase

Show answer
Correct Option: C
Explanation:

Stores of readily available glucose to supply the tissues with an oxidizable energy source are found principally in the liver, as glycogen. 

Glycogen is a polymer of glucose residues, linked by (1,4)- and -(1,6)-glycosidic bonds. A second major source of stored glucose is the glycogen of skeletal muscle. 
However, muscle glycogen is not generally available to other tissues, because muscle lacks the enzyme glucose-6-phosphatase. 
Glucose-6-phosphatase enzyme catalyses the conversion of glucose-6-phosphate to glucose. So, Blood glucose level is not dependent upon muscle glycogen.

One of the following is a set of antagonistic muscles. Select the wrong set.

evs the muscular system and digestive system in human beings human muscular system closer look into muscular system muscles and its types

  1. Fexor, Relaxor

  2. Abductor, Adductor

  3. Pronator, Supinator

  4. Elevator, Depressor

Show answer
Correct Option: A

Flexation of thigh, knee and their rotation is facilatated by

evs the muscular system and digestive system in human beings human muscular system closer look into muscular system muscles and its types

  1. Biceps muscle

  2. Triceps muscle

  3. Sartorius muscles

  4. Shank

Show answer
Correct Option: C
Explanation:

The sartorius muscle is the longest superficial muscle in the interior compartment of the human body. It is a two joint muscle that moves both hip and knee joint. It forms the lateral boundary of the femoral triangle and covers the abductor canal. It flexes the hip and knees and helps in the lateral rotation and thigh abduction. These all are necessary for the crossed leg position. So, the correct option is C.

In a normal human adult male, the total weight of muscle is

evs the muscular system and digestive system in human beings human muscular system closer look into muscular system muscles and its types

  1. 10 kg

  2. 20 kg

  3. 30 kg

  4. 50 kg

Show answer
Correct Option: C
Explanation:
  • In a normal human adult male, the total weight of muscle is 30 kg.
  • Muscle mass is important in determining healthy body composition. A person with a higher % of muscle mass finds it easier to move but needs more energy to do it. 
  • The normal muscle mass percentage on the bodyweight lies between 38% and 54% for men and between 28% and 39% for women depending on age and physical activity level.

    Hence, option C is the answer.

State whether the following statements are true or false.
Involuntary muscles have no myosin or actin since they lack striations.

evs the muscular system and digestive system in human beings human muscular system closer look into muscular system muscles and its types

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Skeletal muscle is composed of muscle fibres which have smaller units called myofibrils. There are three types of proteins make up each myofibril; they are contractile, regulatory and structural proteins. By contractile proteins, we mean actin (thin filament) and myosin (thick filament).

So, the correct option is 'False'.

Long distance, competitive runners are usually small and why and run more slowly than sprinters, who run much shorter distances and generally have a large bulk of muscles. Which of the following best explains the differences between the two types of runners.

evs the muscular system and digestive system in human beings human muscular system closer look into muscular system muscles and its types

  1. Long distance runners run more slowly because lactic acid quickly builds up in their muscles and causes fatigue. Sprinters do not run for a long enough for lactic acid to build up in their muscles.

  2. The large muscles of sprinters Increases the oxygen supply to each muscle, preventing lactic acid from forming.

  3. Sprinters do not run for long enough for sufficient lactic acid to build up in thek muscles therefore they can have large muscles for more power. By being lighter and running more slowly long distance runners ensure that their muscles receive enough oxygen for aerobic respiration.

  4. Sprinters run faster because their large muscles have more blood running through them to stop anaerobic respiration from taking place. Long distance runners run nine slowly because they ate using the energy from anaerobic respiration, which does not produce as much ATP as aerobic respiration.

Show answer
Correct Option: A
Explanation:

When there is oxygen deficiency in the muscle cells, they undergo anaerobic respiration and start producing lactic acid. This lactic acid causes muscle fatigue. The muscle that has been contracted many times short intervals, exhaust its storage of ATP and glycogen and produces lactic acid. 

The runners that run for larger distances need slow twitch muscles so that the oxygen supply does not get exhausted and sustain their long run. The lactic acid will cause fatigue and lead to the collapse of the muscles. 
On the other hand, the sprinters that run for a short duration of time, want faster consumption of oxygen because they do not have to run for the longer amount of time and larger distance so they can where the lactic acid accumulation as it won't affect the performance.
So, the correct option is 'Long distance runners run more slowly because lactic acid quickly builds up in their muscles and causes fatigue. Sprinters do not run for a long enough for lactic acid to build up in their muscles.'

Percentage of water present in oceans and seas is

evs water in our life where do we get water from? why conserve water uses of water

  1. 60 %

  2. 70 %

  3. 80 %

  4. 95 %

Show answer
Correct Option: D
Explanation:

Around 71% of earths surface is covered with water, oceans and seas contain maximum amount which is around 96.5%

So, the correct answer is '95 %'

Part of earth covered by water is about :

evs water in our life where do we get water from? why conserve water uses of water

  1. 71%

  2. 50%

  3. 92%

  4. 87%

Show answer
Correct Option: A
Explanation:

About 71% of earths surface is covered by water & about 96% of water is present in oceans

So, the correct answer is '71%'