Practice Questions

TLS Online TPP Program

#Question id: 34143

Which of the following best explains how normal plasma oxytocin levels at the onset of labor can still result in powerful uterine contractions?

#Unit 7. System Physiology – Animal

The uterus begins secreting its own oxytocin, which inhibits progesterone and directly stimulates the fetal adrenal cortex.
The descent of the fetus stimulates a hypothalamic feedback loop that rapidly increases systemic oxytocin to supraphysiologic levels.
There is a marked upregulation of uterine oxytocin receptors at term, making the myometrium hypersensitive even to baseline oxytocin levels, initiating a positive feedback loop.
Oxytocin receptors on the cervix and vagina directly stimulate the anterior pituitary to secrete oxytocin during early labor.

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TLS Online TPP Program

#Question id: 7071

#Unit 5. Developmental Biology

The zygote of C.elegans exhibits

TLS Online TPP Program

#Question id: 7072

#Unit 5. Developmental Biology

Formation of Henson’s node takes place by:

TLS Online TPP Program

#Question id: 7073

#Unit 5. Developmental Biology

The cell migrations that form the primitive streak thus appear to be regulated by:

TLS Online TPP Program

#Question id: 7074

#Unit 5. Developmental Biology

The left-right axis decided by the paracrine factor ____a___ and the transcription factor___b_____ expressed in ____c_____ side.

TLS Online TPP Program

#Question id: 7075

#Unit 5. Developmental Biology

During limb formation, wnt signaling determines which of the following axis?

TLS Online TPP Program

#Question id: 7076

#Unit 5. Developmental Biology

In case of sea urchin, the skeletogenic mesenchyme cells are: