Answer: 1
Homeostasis in terms of temperature within the human body is achieved by reaction to stimulation from the environment. For example, in cold temperatures our bodies shiver to get warm.
Answer:These contractile elements are virtually identical to skeletal muscle. ... (a) Cardiac muscle cells have myofibrils composed of myofilaments arranged in sarcomeres, ... The refractory period is very long to prevent the possibility of tetany, a ... At this point, the calcium ion channels close and K+ channels open, allowing outflux ..
Explanation:
3. D
4. C
(DNA contains phosphorus)
From Pearson Biology book
Answer:
your answer will be D hope ur help and mark me brainlist
