Homework Answers
2) Blood vessels : blood vessels present in the dermis helps in thermoregulation by dilation & constriction. Heat causes them to dilate & cold causes them to constrict.
Swat glands are important for thermoregulation. When the temperature increases within the body. The eccrine glands produces sweat on to the skin & cools the body.
Apocrine glands : they secrete substances having lipids & other components, so they are oily in nature. They can act as a shield when they are mixed with the sweat.
3) In mammals, they are tiny muscles linked to the hair follicles. The contractions of arrector pili muscles induces the hair to erect, which is also referred as goosebumps. The hairs stand up for trapping the air close to the skin surface in cold conditions.
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6. Draw the Neuromuscular junction and label the Following structures. Include the three substances that interfere with normal muscle contraction (both toxic and therapeutic). ID synapse, neurotransmitter synaptic cleft, axon terminal, synaptic bulb, synaptic vesicles, motor end plate, acetylcholine receptors, Junctional folds, acetylcholinesterase. 7. Describe or draw each of the contractile proteins (actin/myosin) and regulator proteins (troponin & tropomyosin). Explain the set up and how each participate in muscle contraction. Name the protein that attaches the sarcomere to the sarcolemma...
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