Biology
The figures A and B given below represent the ways of heat regulation in our body with the help of blood vessels. Study the figures and answer the following questions.
(a) Name the process/condition shown in figures A and B.
(b) During what climatic conditions, do these processes occur in our body?
(c) What colour change do we see in the facial appearance of a person during these situations?
(d) Do these situations occur due to emotional causes? If yes, name them.
Answer
(a) The process/condition shown in figures A and B are :
- A → Vasoconstriction
- B → Vasodilation
(b) Vasoconstriction occurs in cold climatic conditions. Vasodilation occurs in hot climatic conditions.
(c) The facial appearance of a person becomes pale or bluish during vasoconstriction and reddish during vasodilation.
(d) These situations may occur due to fright, nervousness or sudden emotion.
Related Questions
Draw a labelled diagram of the generalized vertical section of mammalian skin.
Given below is a diagrammatic sketch of the vertical section of human skin.
(a) Label the parts numbered 1 to 9
(b) State one main function of each of the following parts:
- Part 2.
- Part 3.
- Part 4.
- Part 9.
(c) Name any one of the above parts which has at least three functions.
(d) Part 4 may add to one's good appearances or the "figure". State one example of this function which may be common to both men and women.