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AnnZ [28]
3 years ago
10

_____ evolved during the jurassic or cretaceous periods

Biology
2 answers:
BARSIC [14]3 years ago
6 0
It could be dinosaurs, or a specific species... could you be more specific with what it's related to?
dedylja [7]3 years ago
4 0

Answer:

Angiosperms  evolved during the Jurassic or Cretaceous periods.

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A deficiency of this vitamin is very rare, but those with inadequate intakes can experience numbness, muscle cramps, and difficu
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3 years ago
increasing intracellular cAMP leads to smooth muscle relaxation by: Group of answer choices inhibiting IP3 channels, leading to
kirza4 [7]

Answer:

1. Inhibiting IP3 channels, leading to decreased Ca2 in the sarcoplasm and reduced contraction.  

2. Increasing the relative activity of MLCP, leading to a decrease in tension.

3. Activating K channels, increasing K leaking out of the cell which hyperpolarizes it and decreases the likelihood of Ca2 entry.

Explanation

In smooth muscle, cyclic AMP (cAMP) mediates relaxation because cAMP inhibits a specific kinase required for myosin light chain protein (MLCP) phosphorylation, thereby triggering contraction in the smooth muscles. It has been shown that cAMP inhibits 1,4,5-trisphosphate (IP3)-dependent calcium ions (Ca 2+) release by activation of the cGMP-dependent protein kinase (PKG). PKG proteins act to modulate Ca2+ oscillations by stimulating sarcoplasmic Ca2+-ATPase membrane proteins, increasing Ca2+ in the sarcoplasmic reticulum stores and Ca2+ efflux from the cells, and activate voltage-gated potassium (K) channels, thereby leading to membrane hyperpolarization and reducing Ca2+ entry through Ca2+ channels.

6 0
2 years ago
Functional traits can be shared between organisms with divergent ssu rrna sequences because
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3 0
3 years ago
which of the following describes a reason for making a prediction when doing a controlled experiment? a. to determine what sort
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