Tag: the muscular system and digestive system in human beings
Questions Related to the muscular system and digestive system in human beings
In a normal human adult male, the total weight of muscle is
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10 kg
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20 kg
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30 kg
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50 kg
- 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.
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True
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False
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).
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.
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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.
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The large muscles of sprinters Increases the oxygen supply to each muscle, preventing lactic acid from forming.
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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.
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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.
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.
Biceps muscles connect humerous with the ________
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Radius, ulna
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Scapula
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Pectoral girdle
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Skull
The biceps, also known as biceps brachii lies on the front of the upper arm between the shoulder and the elbow. The biceps brachii has two heads, or origins. Both heads originate on the scapula. The long head attaches to the supraglenoid tubercle of the scapula, which is just above the space where the humerus, or upper arm, enters the shoulder. The short head attaches to the coracoid process of the scapula. Both heads converge into one muscle, that runs the length of the humerus. The biceps brachii crosses the inside of the elbow and attaches at the radial tuberosity, which is a feature on the radius - one of the two bones (Ulna is other bone) in- the lower arm. In this way it attaches humerus with the radius and ulna.
Muscle is responsible for ____________.
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Immunity
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Locomotion
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Respiration
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None of the above
Muscles function is to produce force and motion. They are primarily responsible for maintaining and changing posture, locomotion, as well as movement of internal organs, such as the contraction of the heart and the movement of food through the digestive system via peristalsis. Therefore, (b) is the correct answer.
Find the odd out and state category of rest ;
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Thymine, Cytosine, Adenine, Pepsin
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Cortisone , Somatotropin, Adrenocorticotropic hormone, Vasopressin
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Cerebrum, Cerebellum, Thalamus, Hypothalamus
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Urea, Creatinine, Ammonia, Uric acid
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Neutrophils, Eosinophils, Basophils, Lymphocytes
(A)Pepsin is not a nitrogenous base.
The undigested, semisolid food is called
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Anus
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Faeces
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Rectum
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Villi
- The human digestive system consists of a long muscular tube and several accessory organs such as the salivary glands, pancreas and gall bladder.
- It is responsible for food ingestion and digestion, absorption of digestion products and the elimination of undigested materials.
- Undigested semi-solid food remaining in the large intestine is called faeces which are eliminated through the anus.
The longest part of the alimentary canal is
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Oesophagus
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Large intestine
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Small intestine
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Stomach
- The alimentary canal includes the mouth, pharynx, oesophagus, stomach, small intestine, large intestine, and anus.
- The longest part of the alimentary canal is small intestine because it is the main organ of absorption and digestion of food.
- The surface area of the small intestine gets increased because of the presence of villi which gives food plenty of time to break down properly. Hence, the longest part of the alimentary canal is a small intestine.
Stomach secretes
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Dilute hydrochloric acid
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Dilute sulphuric acid
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Dilute citric acid
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Dilute nitric acid
- Parietal cells in the stomach contain an extensive secretory network from which the dilute hydrochloric acid is secreted into the lumen of the stomach.
- This dilute Hydrochloric acid activates pepsinogen into the enzyme pepsin, which then helps digestion by breaking the bonds linking amino acids, a process known as proteolysis. Hence, Stomach secretes Dilute hydrochloric acid'
Bile is secreted by
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Stomach
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Small intestine
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Pancreas
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Liver
- Bile is a dark green to yellowish brown fluid, produced by the liver of most vertebrates, that helps in the digestion of lipids in the small intestine.
- In humans, bile is produced continuously by the liver, and stored and concentrated in the gallbladder. Hence, Bile is secreted by the liver.