The following paragraph outlines the responses of an endotherm to a decrease in environmental temperatures.
A decrease in core body temperature is detected by ...................................... which brings about a series of responses in the body. ...................................... in the surface of the skin ...................................... to reduce heat loss by radiation. Erector pili muscles in the skin ...................................... and the skeletal muscles contract and relax ...................................... to generate heat.
Which option from A-D gives the correct sequence of missing words to complete the paragraph?
Receptors in the skin, capillaries, contract, relax, slowly
The hypothalamus, capillaries, constrict, contract, consciously
Receptors in the skin, arterioles, constrict, constrict, involuntarily
The hypothalamus, arterioles, constrict, contract, involuntarily