Tag: role of receptors in the mouth

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Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Number of teeth  which are monophyodont in man are

  1. 4

  2. 22

  3. 32

  4. 12
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Majority of mammals including human being forms two sets of teeth during their life, a set of temporary, milk or deciduous teeth replaced by a set of permanent or adult teeth. This type of dentition is called diphyodont. An adult human has 32 permanent teeth, which are of four different types, namely, incisors (I), canine (C), premolars (PM) and molars(M). Arrangement of teeth in each half of the upper and lower jaw in the order I, C, PM, M is represented by a dental formula which in humanis 2123/ 2123. In children the premolars and last molar are absent. Hence the child has dental formula 2102/ 2102. The number of teeths according to this dental formula will be 20. These teeth will be diphyodont and (32-20) or 12 teeth will be monophyodont.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

The hardest constituent of the tooth is

  1. Enamel

  2. Dentine

  3. Bone

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

Enamel is the hardest substance in the human body and contains the highest percentage of minerals, 96%, with water and organic material. The primary mineral is hydroxyapatite, which is a crystalline calcium phosphate.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

How many teeth in man grows twice in life?

  1. 32

  2. 28

  3. 20

  4. 12
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Majority of mammals including human being forms two sets of teeth during their life, a set of temporary, milk or deciduous teeth replaced by a set of permanent or adult teeth. This type of dentition is called diphyodont. An adult human has 32 permanent teeth, which are of four different types, namely, incisors (I), canine (C), premolars (PM) and molars(M). Arrangement of teeth in each half of the upper and lower jaw in the order I, C, PM, M is represented by a dental formula which in human is 2123/ 2123. The premolars and last molars are absent in children. Thus the teeth which grow twice are incisors, canines and two molars i.e., a total of 20 teeth.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Amount of water in enamel is

  1. 90 - 92%

  2. 75 - 80%

  3. 40 - 50%
  4. $\approx $ 3%
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Enamel is the hardest material of animal kingdom. Enamel is ectodermal. It is secreted by Ameloblast cells of the ectoderm. lt has maximum amount of inorganic salt (96%) in It. Inorganic salt are mainly found in the form of phosphate and carbonate of Ca, Mg, Na and K. 3% of water is found in the enamel. Along with it Keratin and  ossein are also found in teeth. Ossein is a protein of bones, remaining part of tooth develops from mesoderm of embryo.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Cheek teeth are

  1. Inscisors and canines

  2. Canines and premolars

  3. Premolars and molar

  4. Canines and molars
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cheek teeth or post canines comprise the molar and premolar teeth in mammals. Cheek teeth are multicuspidate (having many cusps or tubercles). Mammals have multicuspidate molars.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Teeth not found in

  1. Primitive jawless fishes

  2. Lampreys

  3. Sharks

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

Teeth appear to have first evolved in sharks, and are not found in the more primitive jawless fish. Lampreys do have tooth-like structures on the tongue, these are in fact, composed of keratin, not of dentine or enamel, and bear no relationship to true teeth. 

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Incisor present in which bone of human jaw?

  1. Premaxilla

  2. Maxilla

  3. Palatine

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • The premaxilla is one of a pair of small cranial bones at the very tip of the upper jaw of many animals, usually, but not always, bearing teeth. 
  • In humans, they are fused with the maxilla and usually termed as the incisive bone (the portion of the maxilla adjacent to the incisors). Hence,  Incisor is present in premaxilla of the human jaw.
So, the correct answer is 'premaxilla'.

Multiple choice biology structure and functions of living organisms -ii nervous system in animals structure of neuron structure and function of neuron role of receptors in the mouth types of teeth circulatory system and organs

The nervous system is formed of 

  1. Brain

  2. Spinal cord

  3. Nerves

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

The nervous system is a collection of cells, tissues, and organs ( brain, spinal cord, nerves ) through which an organism receives information from its surroundings and then directs the organism to respond to the stimulus.

So, the correct answer is 'All of the above'.

Multiple choice biology structure and functions of living organisms -ii nervous system in animals structure of neuron structure and function of neuron role of receptors in the mouth types of teeth circulatory system and organs

The organ that helps us to recall and analyse is 

  1. Muscles

  2. Brain

  3. Spinal cord

  4. Nerve
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The brain regulates an array of functions necessary for survival. The brain houses our mind and our memories. Most available evidence suggests that the functions of memory are carried out by the hippocampus and other related structures in the temporal lobe of the brain. The brain also helps in the analysis of various body functions.

So, the correct answer is 'Brain'.

Multiple choice evs structure and functions of living organisms -ii experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Human dentition is described as

  1. Heterodont, diphyodont and thecodont

  2. Heterodont, monophyodont and thecodont

  3. Heterodont, diphyodont, thecodont and bundodont

  4. Heterodont, polyphyodont and pleurodont
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Human dentition can be describes as:

Heterodont: the teeth are morphologically different from each other.
Diphyodont: there are two sets of teeth that appear in the lifetime, the milk-teeth and the permanent teeth.
Thecodont: the teeth are firmly enclosed within the deep socket of the jaw bone.
Hence, the correct answer is 'Heterodont, diphyodont and thecodont'.