Explain the Sliding Filament theory of skeletal muscle contraction. In doing so explain the contribution of actin and myosin filaments, tropomyosin, ATP, and Ca++ ions.

Please help a homie out I’m in a quiz.

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.)chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks