The thick middle layer of the heart, composed of cardiac muscle, is the
A. endocardium.
B. myocardium.
C. epicardium.
D. chordae tendineae.
Ans: B. myocardium.
You might also like to view...
How do eukaryotic transcription factors exert their effects on transcription when their binding sites can be thousands of base pairs away from the promoter?
A. Regulatory proteins bind the sequences and then slide along the DNA until they reach an RNA polymerase bound to a promoter. B. After binding to the site, the regulatory protein releases the DNA and is targeted to the polymerase via coactivator proteins. C. Once bound to the site, the regulatory protein catalyzes the formation of an effector molecule that then travels to and binds the polymerase. D. The DNA between the bound site and the polymerase-promoter complex loops out, increasing proximity.
Nucleosomes are organized into large coiled loops held together by:
a. histones. b. centromeres. c. kinetochore proteins. d. scaffolding proteins. e. condensins
The overall effect of renin release will be to
A. inhibit aldosterone secretion. B. lower blood volume. C. decrease hydrogen ion excretion and decrease sodium and bicarbonate ion absorption. D. increase blood volume and pressure. E. lower blood pressure.
Which gland responds to light and is involved in daily rhythms in some animals?
A) Pineal B) Adrenal C) Thymus D) Pancreas E) Pituitary